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Equipment Discussions >> Eyepieces

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JMW
Pooh-Bah


Reged: 02/11/07

Loc: Nevada
ES 25mm 100 AFOV Shipped
      #5603917 - 01/03/13 11:58 PM

Astronomics called today and asked if I still wanted the eyepiece I ordered last February 2012. I said sure. I now have a tracking number and it should be here on January 8th. Has anyone else received one yet?

I will be interested to see how it fits between my Ethos 21mm and my Nag 31T5. I like to use multiple scopes at the same time so I don't mind the overlap. Most of the time at a dark site I will have an Obsession 20 inch F5 set up near my TEC 140 on a DM6 mount. I love wide apparent field of view eyepieces. It makes using push-to scopes much more fun.

Edited by JMW (01/04/13 01:32 PM)


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Dave Ittner
sage
*****

Reged: 05/29/12

Loc: SF Bay Area, California
Re: ES 255mm 100 AFOV Shipped new [Re: JMW]
      #5603939 - 01/04/13 12:24 AM

wow, congrats.

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MRNUTTY
Carpal Tunnel
*****

Reged: 11/22/11

Loc: Mendon, MA
Re: ES 255mm 100 AFOV Shipped new [Re: Dave Ittner]
      #5604160 - 01/04/13 07:06 AM

I got the same message Jeff. Looking forward to it!

Now where's the 5.5mm? And what's up next for ES?

Edited by MRNUTTY (01/04/13 07:07 AM)


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Damo636
sage


Reged: 08/16/11

Loc: Co Fermanagh, Northern Ireland
Re: ES 255mm 100 AFOV Shipped new [Re: MRNUTTY]
      #5604165 - 01/04/13 07:11 AM

Next up hopefully will be a Paracorr clone at a fraction of the price

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csa/montana
Den Mama
*****

Reged: 05/14/05

Loc: montana
Re: ES 255mm 100 AFOV Shipped new [Re: Damo636]
      #5604618 - 01/04/13 11:40 AM

Quote:

Next up hopefully will be a Paracorr clone at a fraction of the price




Don't know the pricing, but there was an AT "paracorr" at the Arizona show a while back.


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dscarpa
Post Laureate
*****

Reged: 03/15/08

Loc: San Diego Ca.
Re: ES 255mm 100 AFOV Shipped new [Re: JMW]
      #5604755 - 01/04/13 01:03 PM

255 mm? David

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JMW
Pooh-Bah


Reged: 02/11/07

Loc: Nevada
Re: ES 25mm 100 AFOV Shipped new [Re: dscarpa]
      #5604809 - 01/04/13 01:32 PM

Thanks. Fixed the typo.

Edited by JMW (01/04/13 01:33 PM)


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Tank
Carpal Tunnel
*****

Reged: 07/27/09

Loc: Stoney Creek, Ontario, CANADA
Re: ES 25mm 100 AFOV Shipped new [Re: JMW]
      #5604828 - 01/04/13 01:40 PM

What to here some feedback on this one!

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Mr Magoo
Carpal Tunnel
*****

Reged: 11/05/05

Loc: Indiana
Re: ES 25mm 100 AFOV Shipped new [Re: JMW]
      #5604838 - 01/04/13 01:43 PM

I ordered 3 during Christmas. I'm afraid to even ask how long they will be back ordered. Has this time frame been the norm with them?

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Astrojensen
Post Laureate
*****

Reged: 10/05/08

Loc: Bornholm, Denmark
Re: ES 25mm 100 AFOV Shipped new [Re: Mr Magoo]
      #5605016 - 01/04/13 03:22 PM

Quote:

I ordered 3 during Christmas. I'm afraid to even ask how long they will be back ordered. Has this time frame been the norm with them?




ES is the new AP...


Clear skies!
Thomas, Denmark


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MRNUTTY
Carpal Tunnel
*****

Reged: 11/22/11

Loc: Mendon, MA
Re: ES 25mm 100 AFOV Shipped new [Re: Mr Magoo]
      #5605068 - 01/04/13 03:52 PM

Ken, I put my pre-order in several months ago. Also, the 5.5mm. I checked with Astronomics to see if my pre-order(s) were still in the system; they were. I pre-ordered because I didn't want to watch it like a hawk to get an early unit. I doubt many pre-ordered for my reasons :-)

Edited by MRNUTTY (01/04/13 03:54 PM)


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Starman1
Vendor (EyepiecesEtc.com)
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Reged: 06/24/03

Loc: Los Angeles
Re: ES 25mm 100 AFOV Shipped new [Re: MRNUTTY]
      #5605113 - 01/04/13 04:09 PM

Note: the 5.5mm x 100 degree and the Coma Corrector are far enough away that ES isn't even talking about them.
The 3" 30mm will be here sooner.
ES got a small number of 25mm x 100 degree eyepieces and shipped them at the end of December from Arkansas.


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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: ES 25mm 100 AFOV Shipped new [Re: MRNUTTY]
      #5605128 - 01/04/13 04:15 PM

AgenaAstro currently shows 5 available and EyepiecesEtc.com may have some........

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JMW
Pooh-Bah


Reged: 02/11/07

Loc: Nevada
Re: ES 25mm 100 AFOV Shipped new [Re: Starman1]
      #5605146 - 01/04/13 04:25 PM

I will let you know how it looks through my TEC-140. I probably won't try it on the Obsession 20 inch F5 until spring comes. I don't like setting up large truss dobs in the snow. My TEC-140 is currently on my pier under my roll away shed observatory.

I knew it would be a long wait. I didn't have to put down a deposit so I wasn't worried about the time. I put down an $800 dollar deposit and waited 18 months for my SV115T. The wait is easier if you just forget about the gear until you hear that it is shipping.


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Dr Morbius
Post Laureate
*****

Reged: 02/06/07

Loc: ManorvilleNY-but not for long
Re: ES 25mm 100 AFOV Shipped new [Re: JMW]
      #5605191 - 01/04/13 04:48 PM

Got mine yesterday - haven't tried it yet but beware, it's about as heavy as the 31 Nagler. Feels good in the hand, though.

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Starman81
Carpal Tunnel
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Reged: 03/06/08

Loc: Metro Detroit, MI, USA
Re: ES 25mm 100 AFOV Shipped new [Re: Dr Morbius]
      #5605202 - 01/04/13 04:53 PM

Quote:

Got mine yesterday - haven't tried it yet but beware, it's about as heavy as the 31 Nagler. Feels good in the hand, though.




Pictures would be GREAT!


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russell23
Post Laureate
*****

Reged: 05/31/09

Loc: Upstate NY
Re: ES 25mm 100 AFOV Shipped new [Re: Starman1]
      #5606228 - 01/05/13 10:05 AM

Quote:

Note: the 5.5mm x 100 degree and the Coma Corrector are far enough away that ES isn't even talking about them.
The 3" 30mm will be here sooner.
ES got a small number of 25mm x 100 degree eyepieces and shipped them at the end of December from Arkansas.




I wish ES would provide more information about the 5.5mm. Are we talking 2 years, 3 years ... never ... before this eyepiece comes out. One person posted here months ago that in a conversation with an ES employee he was told there would be no 5.5mm ES100. Then someone from Astronomics talked to Scott and confirmed that there will be a 5.5mm ES100.

But you shouldn't put it out there if it is 2-3 years away from actual production. I don't remember exactly when Astronomics listed it on its website, but it has been over a year I believe.

Dave


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Starman1
Vendor (EyepiecesEtc.com)
*****

Reged: 06/24/03

Loc: Los Angeles
Re: ES 25mm 100 AFOV Shipped new [Re: russell23]
      #5606246 - 01/05/13 10:18 AM

Don't forget those special unobtainium lenses.

Seriously, companies advertise products before they're available all the time,
but usually it's only a few months. There could have been some glitches that made them postpone production.

Like, perhaps, having so much demand for their eyepieces world-wide that there is a shortage? if working on a 5.5x100 means you can't make more 6.7x82 and you're back-ordered up the wazoo on the 6.7's, it might be prudent to postpone the 5.5, eh?


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russell23
Post Laureate
*****

Reged: 05/31/09

Loc: Upstate NY
Re: ES 25mm 100 AFOV Shipped new [Re: Starman1]
      #5606308 - 01/05/13 10:52 AM

Quote:

Don't forget those special unobtainium lenses.

Seriously, companies advertise products before they're available all the time,
but usually it's only a few months. There could have been some glitches that made them postpone production.

Like, perhaps, having so much demand for their eyepieces world-wide that there is a shortage? if working on a 5.5x100 means you can't make more 6.7x82 and you're back-ordered up the wazoo on the 6.7's, it might be prudent to postpone the 5.5, eh?




I'm sure that their pricing on their current eyepiece offerings has resulted in a sale volume that is slowing things down on some of their in development eyepieces. But they already have a prototype for a 3" 30mm 100 deg eyepiece and none for the 5.5mm 100 deg that has been listed as pre-order for over a year. That doesn't make any sense. And their 100 deg line needs something in the 5.5mm range so you would think there would be a bit more urgency about that.

Dave


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Fred1
Carpal Tunnel
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Reged: 09/19/07

Loc: Somewhere in the Orion Spur
Re: ES 25mm 100 AFOV Shipped new [Re: Dr Morbius]
      #5606685 - 01/05/13 01:58 PM

Quote:

Got mine yesterday - haven't tried it yet but beware, it's about as heavy as the 31 Nagler. Feels good in the hand, though.




Your comments on eye relief would be very much appreciated. I can find no mention of ER in the specs. Thanks.


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Scott in NCAdministrator
80mm Refractor Fanatic
*****

Reged: 03/05/05

Loc: NC
Re: ES 25mm 100 AFOV Shipped new [Re: Fred1]
      #5606695 - 01/05/13 02:05 PM

Very cool! I can't wait to hear your impressions of it once you get it out under the night skies.

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JimMo
I'd Rather Do It Myself


Reged: 01/08/07

Loc: Under the SE Michigan lightdom...
Re: ES 25mm 100 AFOV Shipped new [Re: Scott in NC]
      #5606885 - 01/05/13 04:04 PM

Quote:

Very cool! I can't wait to hear your impressions of it once you get it out under the night skies.




+1 Look forward to the reports. Don't know if I'll jump on the sale price or not. I've been fortunate to have accumulated over time an almost complete set of Ethos, but I'm wondering if the new ES 25mm could replace both a 21E and the 31T5 I've been hanging on to. The 25mm might be a better jump to my 17E than either one and it would also lighten up my EP case a bit.


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Shneor
scholastic sledgehammer
*****

Reged: 03/01/05

Loc: Northern California
Re: ES 25mm 100 AFOV Shipped new [Re: JimMo]
      #5606933 - 01/05/13 04:37 PM

Astronomics recieved just 5 of these from ES.

Clears,


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faackanders2
Carpal Tunnel


Reged: 03/28/11

Re: ES 25mm 100 AFOV Shipped new [Re: russell23]
      #5607024 - 01/05/13 05:49 PM

Quote:

Quote:

Don't forget those special unobtainium lenses.

Seriously, companies advertise products before they're available all the time,
but usually it's only a few months. There could have been some glitches that made them postpone production.

Like, perhaps, having so much demand for their eyepieces world-wide that there is a shortage? if working on a 5.5x100 means you can't make more 6.7x82 and you're back-ordered up the wazoo on the 6.7's, it might be prudent to postpone the 5.5, eh?




I'm sure that their pricing on their current eyepiece offerings has resulted in a sale volume that is slowing things down on some of their in development eyepieces. But they already have a prototype for a 3" 30mm 100 deg eyepiece and none for the 5.5mm 100 deg that has been listed as pre-order for over a year. That doesn't make any sense. And their 100 deg line needs something in the 5.5mm range so you would think there would be a bit more urgency about that.

Dave




Manufacturing and development are ususally done by different people.

I like ES sharing future product intentions, but whish they would also advise expected timeimg: < 3 months, < 6 months, < 1 year, < 2 years, or > 2 years.

Had I known the 5.5mm 100AFOV would still be a year away, I may have gotten the 4.5mm 110AFOV for XMAS whilt the TV sale was on. Don't mislead customers, unless you are early.


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faackanders2
Carpal Tunnel


Reged: 03/28/11

Re: ES 25mm 100 AFOV Shipped new [Re: JimMo]
      #5607049 - 01/05/13 05:59 PM

Quote:

Quote:

Very cool! I can't wait to hear your impressions of it once you get it out under the night skies.




+1 Look forward to the reports. Don't know if I'll jump on the sale price or not. I've been fortunate to have accumulated over time an almost complete set of Ethos, but I'm wondering if the new ES 25mm could replace both a 21E and the 31T5 I've been hanging on to. The 25mm might be a better jump to my 17E than either one and it would also lighten up my EP case a bit.




As a confirmed eyepiece addict, "lighten up" has not become part of my vocabulary yet (although I don't always take all my eypieces out, depends on how long I plan to observe, and what my goal for observing that night is).


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jochsner
member


Reged: 01/11/12

Loc: PA
Re: ES 25mm 100 AFOV Shipped new [Re: faackanders2]
      #5607136 - 01/05/13 06:41 PM

Got the last 25mm 100 Highpoint had. Could not believe it was still In-stock this morning! No waiting list there I guess?
Now when is the 9mmm 120 going be in stock at Astronomic or Highpoint i wonder?
I'll send a pic and report once I try it out the 25mm 100.


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DRodrigues
super member


Reged: 08/08/11

Re: ES 25mm 100 AFOV Shipped new [Re: Fred1]
      #5607201 - 01/05/13 07:50 PM

Quote:


Your comments on eye relief would be very much appreciated. I can find no mention of ER in the specs. Thanks.



At Astronomics is referred as 14mm. This model seems to have better top ep and rubber eyecup designs than the others ES 100 models (on those there is 2 or 3 mm ER loss for eye-glass users...), so hopefully 14mm is the usable ER for eyeglass users...


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Tamiji Homma
Post Laureate
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Reged: 02/24/07

Loc: California, USA
Re: ES 25mm 100 AFOV Shipped new [Re: JMW]
      #5607210 - 01/05/13 08:02 PM

Hi Jeff,

When you have a chance, could you measure how much inward/outward focus distance ES25-100 is required to come to focus to infinity comparing to Nagler 31T5?

I am hoping that ES25-100 doesn't require more inward focus than Nagler 31T5.

Thanks.

Tammy


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turtle86
Pooh-Bah Everywhere Else
*****

Reged: 10/09/06

Re: ES 25mm 100 AFOV Shipped new [Re: JimMo]
      #5607214 - 01/05/13 08:04 PM

Quote:

Quote:

Very cool! I can't wait to hear your impressions of it once you get it out under the night skies.




+1 Look forward to the reports. Don't know if I'll jump on the sale price or not. I've been fortunate to have accumulated over time an almost complete set of Ethos, but I'm wondering if the new ES 25mm could replace both a 21E and the 31T5 I've been hanging on to. The 25mm might be a better jump to my 17E than either one and it would also lighten up my EP case a bit.




+2 I've got complete set of Ethos and a 31T5 myself, and I'm very happy with them all, but I'm similarly thinking about replacing the 8 and 10mm Ethos with a 9mm 120 degree ES, and my 21E and 31T5 with a 25mm 100 ES. Sure, it would be nice to have them all, but economic considerations aside, I sure don't *need* them all and besides, these bad boys would take up lots of real estate in my EP cases!


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JMW
Pooh-Bah


Reged: 02/11/07

Loc: Nevada
Re: ES 25mm 100 AFOV Shipped new [Re: turtle86]
      #5607704 - 01/06/13 02:24 AM

I have a large Pelican case but I am considering selling my Nagler T4 eyepieces. I no longer have room for them in my case. I should sell all 3 to finance and make room for a Paracorr Type II.

My 12T4 is the furthest from being par focal with the rest of my 2 inch eyepieces.


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JimMo
I'd Rather Do It Myself


Reged: 01/08/07

Loc: Under the SE Michigan lightdom...
Re: ES 25mm 100 AFOV Shipped new [Re: faackanders2]
      #5608481 - 01/06/13 02:08 PM

Quote:

[
As a confirmed eyepiece addict, "lighten up" has not become part of my vocabulary yet (although I don't always take all my eypieces out, depends on how long I plan to observe, and what my goal for observing that night is).




Hi Ken, It's funny that even though I would confess to being an eyepiece addict I now have fewer eyepiece than I had five years ago and still trying to thin the herd even more. As I said, sometimes I use only two eyepiece in a whole session with my dob in darker skies and don't think I'm missing anything. That is, unless the seeing is better than average and then 1.6x and 2x barlows could solve that problem.


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Shneor
scholastic sledgehammer
*****

Reged: 03/01/05

Loc: Northern California
Re: ES 25mm 100 AFOV Shipped new [Re: JimMo]
      #5608591 - 01/06/13 02:57 PM

Agena Astro's web site says they have this eyepiece in stock but "photo to follow".

Clears,


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Damo636
sage


Reged: 08/16/11

Loc: Co Fermanagh, Northern Ireland
Re: ES 25mm 100 AFOV Shipped new [Re: Fred1]
      #5608744 - 01/06/13 04:16 PM

Still no pics

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Mr Magoo
Carpal Tunnel
*****

Reged: 11/05/05

Loc: Indiana
Re: ES 25mm 100 AFOV Shipped new [Re: Damo636]
      #5608819 - 01/06/13 05:00 PM

Here is a link to a picture. 25mm EP Pretty much guarantee they will all look just like this.

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frebieAdministrator
Chief assistant to the assistant chief


Reged: 04/29/08

Loc: Neither here nor there.
Re: ES 25mm 100 AFOV Shipped new [Re: DRodrigues]
      #5608858 - 01/06/13 05:15 PM

Quote:

Quote:

I can find no mention of ER in the specs. Thanks.



At Astronomics is referred as 14mm. This model seems to have better top ep and rubber eyecup designs than the others ES 100 models (on those there is 2 or 3 mm ER loss for eye-glass users...), so hopefully 14mm is the usable ER for eyeglass users...




The 14mm is the usable eye relief that we measured from top of the rolled-down eyecup to the plane where the image forms. ES has yet to specify the eye relief on their website, but it will probably be in that ball park. The image on our website was one we took after measuring the eye relief.

Edited by frebie (01/06/13 05:17 PM)


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Scott in NCAdministrator
80mm Refractor Fanatic
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Reged: 03/05/05

Loc: NC
Re: ES 25mm 100 AFOV Shipped new [Re: frebie]
      #5609017 - 01/06/13 06:48 PM

That's really good information to know--thanks for sharing that with us, Fred!

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Darenwh
Carpal Tunnel


Reged: 05/11/06

Loc: Covington, GA
Re: ES 25mm 100 AFOV Shipped new [Re: Scott in NC]
      #5610356 - 01/07/13 02:44 PM

Well, since Astronomics was out of stock on this eyepiece I went to AgenaAstro and added it to the cart. While I was there I added the ES100 9mm and the Paracorr 2. I then clicked checkout and that came to $1370 before shipping. I then decided I would rather not get divorced just yet so I closed the tab... Oh well...

Darenwh
(Still happily married)


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JMW
Pooh-Bah


Reged: 02/11/07

Loc: Nevada
Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Darenwh]
      #5612118 - 01/08/13 02:58 PM Attachment (89 downloads)

It has arrived. Here it is with some friends. It isn't the widest or tallest of my eyepiece collection. It may be the heaviest.

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Starman1
Vendor (EyepiecesEtc.com)
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Reged: 06/24/03

Loc: Los Angeles
Re: ES 25mm 100 AFOV Shipped new [Re: JMW]
      #5612156 - 01/08/13 03:21 PM

Yes, it seemed heavier than the 31 Nagler. Did you weigh it?

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denis0007dl
sage
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Reged: 04/17/12

Loc: Croatia
Re: ES 25mm 100 AFOV Shipped new [Re: JMW]
      #5612159 - 01/08/13 03:23 PM

Quote:

It has arrived. Here is is with some friends. It isn't the widest or tallest of my eyepiece collection. It may be the heaviest.




Wow!!!

Now will be interest how ES 25 mm performs vs his brothers in picture!


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JMW
Pooh-Bah


Reged: 02/11/07

Loc: Nevada
Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: denis0007dl]
      #5612187 - 01/08/13 03:36 PM

It weighs 2 pounds 10 oz. My Ethos 21 is the next heaviest. I think the Nag31T5 is slightly lighter than my Pan41. I now have 4 eyepieces over 2 pounds.

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MRNUTTY
Carpal Tunnel
*****

Reged: 11/22/11

Loc: Mendon, MA
Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: JMW]
      #5612415 - 01/08/13 06:04 PM

Darn, it looks like the eye cap is like the 40 and 34mm; it doesn't fit! I should have saved one from my old ES EP's. I wish they would fix this, it's been ages...

Anyway, congrats! I'm still awaiting word on whether I'll get mine soon or not.

Edited by MRNUTTY (01/08/13 06:05 PM)


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Starman1
Vendor (EyepiecesEtc.com)
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Reged: 06/24/03

Loc: Los Angeles
Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: MRNUTTY]
      #5612447 - 01/08/13 06:21 PM

On my gram scale: 1176g.
Yup, that's heavier than a 21 Ethos, which is heavier than a 31 Nagler.

it may not be exact, but I get eye relief of 15mm, which is 12mm off the top of the eyepiece eyecup when it's folded down.

Edited by Starman1 (01/08/13 06:39 PM)


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johnnyha
Postmaster
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Reged: 11/12/06

Loc: Sherman Oaks, CA
Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Starman1]
      #5612534 - 01/08/13 07:01 PM

How big is the eyelens? Any photos?

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turtle86
Pooh-Bah Everywhere Else
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Reged: 10/09/06

Re: ES 25mm 100 AFOV Shipped new [Re: Darenwh]
      #5612553 - 01/08/13 07:15 PM

Quote:

Well, since Astronomics was out of stock on this eyepiece I went to AgenaAstro and added it to the cart. While I was there I added the ES100 9mm and the Paracorr 2. I then clicked checkout and that came to $1370 before shipping. I then decided I would rather not get divorced just yet so I closed the tab... Oh well...

Darenwh
(Still happily married)







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turtle86
Pooh-Bah Everywhere Else
*****

Reged: 10/09/06

Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: JMW]
      #5612556 - 01/08/13 07:17 PM

Quote:

It has arrived. Here it is with some friends. It isn't the widest or tallest of my eyepiece collection. It may be the heaviest.




Thanks for the pic. That'a quite a lineup you've got there.
Looks like it comes in a nice box, too...


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JMW
Pooh-Bah


Reged: 02/11/07

Loc: Nevada
Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: turtle86]
      #5612692 - 01/08/13 08:51 PM

The box is huge. Just takes up extra space for some possible future resale. I have an couple of shelves in a cabinet dedicated to eyepiece boxes. Explorer Scientific boxes are huge compared to Televue.

I like two inch eyepieces. I enjoy wide fields under dark skies. I often use a large dob next to a APO refractor so I like some eyepiece overlap.


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jochsner
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: johnnyha]
      #5612708 - 01/08/13 09:01 PM Attachment (87 downloads)

Got my 25mm-100 today S/N 7. Took a quick look thru my 480/80mm. Looked at M42 and M45 for 15 minutes or so, 19x magnification. The view seemed much flatter than expected right to the edge. Good job ES!
Not even close to being parfocal with the ES 100 9mm or any other 2" EP, needed a lot more in focus! The coating look Orange/Yellow as you can see in my photo.


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JMW
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: jochsner]
      #5612711 - 01/08/13 09:04 PM

I have #8 so I guess they were friends on the manufacturing line.

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Tamiji Homma
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: jochsner]
      #5612716 - 01/08/13 09:06 PM

Quote:

Not even close to being parfocal with the ES 100 9mm or any other 2" EP, needed a lot more in focus!




That is bad news for me. It may not come to focus to infinity with my scopes...

Tammy


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Darenwh
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Tamiji Homma]
      #5612791 - 01/08/13 09:56 PM

Sounds like you may need a little more in focus to reach infinity and even more if you want to reach infinity and beyond.

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Starman1
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Darenwh]
      #5612912 - 01/08/13 11:20 PM

I notice the example I have doesn't have a sharply-focused field stop and has a blue ring around the edge of the field near the edge.
Any of you see the same thing?


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jochsner
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Tamiji Homma]
      #5612999 - 01/09/13 12:32 AM

Did some more quick 25mm-100 tests as the sky cleared here. No problems focusing the 25mm-100 in my 2 SCT's 6" and 8", plenty of focus travel on both sides of prime focus available.
Testing in the 80mm, the 25mm-100 is parfocal with a 1.25" Meade RG-7mm ortho almost perfectly! The RG-7mm has the most in-focus of all my current EP's.
The field stop looks as clean and sharp as the ES 9mm-100 and does have a bluish ring at the edge. The coating somewhat give off a Greenish tingle when held a certain angles.


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Dick Jacobson
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: jochsner]
      #5613327 - 01/09/13 09:01 AM

Is there any noticeable fall-off in brightness near the edge? One post in this forum claimed that it is impossible to create an eyepiece with these specs in a 2-inch barrel without some loss of light at the edge.

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Manish
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: johnnyha]
      #5613335 - 01/09/13 09:06 AM

>>How big is the eyelens? Any photos?

33mm (1.3").

We have several photos and some additional specs up on our website.
http://agenaastro.com/explore-scientific-100-deg-series-eyepiece-25mm.html

Regards,
Manish
www.AgenaAstro.com


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Dave Ittner
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Manish]
      #5613349 - 01/09/13 09:14 AM

Nice photos! So this eyepieces lists at $599.99 and is not on sale at the moment?

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Starman1
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Dick Jacobson]
      #5613500 - 01/09/13 11:00 AM

Quote:

Is there any noticeable fall-off in brightness near the edge? One post in this forum claimed that it is impossible to create an eyepiece with these specs in a 2-inch barrel without some loss of light at the edge.



There is a drop off visible when looking through the eyepiece at the sky. It certainly doesn't appear to be severe, and it is confined to a fairly small ring near the edge.


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Scott in NCAdministrator
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Manish]
      #5613699 - 01/09/13 01:05 PM

Quote:


We have several photos and some additional specs up on our website.
http://agenaastro.com/explore-scientific-100-deg-series-eyepiece-25mm.html





Thanks for posting the stats on your website, Manish!


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Starman1
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Manish]
      #5613757 - 01/09/13 01:43 PM

Manish,
Explore Scientific says this eyepiece has 8 elements, not 9.
Just thought you should know. The element count is on the ES website.


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pbsastro
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Starman1]
      #5613761 - 01/09/13 01:44 PM

Quote:

Quote:

Is there any noticeable fall-off in brightness near the edge? One post in this forum claimed that it is impossible to create an eyepiece with these specs in a 2-inch barrel without some loss of light at the edge.



There is a drop off visible when looking through the eyepiece at the sky. It certainly doesn't appear to be severe, and it is confined to a fairly small ring near the edge.




That slight drop off was expected given the small size of the eyepiece. Looking at the 20mm and 30mm size and weight, it is clear that the 25mm is smaller than expected.
To me it is clear that ES chose (and well) to offer two different and close products: The 25mm being small, light and cheap, and the 30mm being big, heavy, expensive and optically perfect. I will choose the latter, but the former will be more popular I am sure. I always prefer optical perfection, but the size, weight and price will be irresistible to most people, especially compared to the Ethos 21.


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Manish
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Starman1]
      #5613795 - 01/09/13 02:13 PM

>>Explore Scientific says this eyepiece has 8 elements, not 9.

Thanks very much Don! We cloned another EP page from our site to create this one and overlooked editing this.

Regards,
Manish
www.AgenaAstro.com


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pbsastro
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Dick Jacobson]
      #5613804 - 01/09/13 02:16 PM

Quote:

Is there any noticeable fall-off in brightness near the edge? One post in this forum claimed that it is impossible to create an eyepiece with these specs in a 2-inch barrel without some loss of light at the edge.




Even though this 25mm may have a slight loss at the edge, of course it is possible no light loss in 2-inch barrel. Only it would require more infocus.
Anyone can see that any eyepiece with an eye lens clear aperture smaller than 46mm can be made 2” just by attaching a 2” barrel with no lens inside.
Although a field lens clear aperture may be smaller than 46mm, the total lens may not fit inside the barrel, so lenses must start after the barrel.
Even the ES 30-100 can be used with a 2” adapter, as ES demonstrated, although in that case as the field lens is 52mm it is really vignetted by the 2” barrel 46mm ID.


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pbsastro
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Starman1]
      #5613812 - 01/09/13 02:20 PM

Quote:

I notice the example I have doesn't have a sharply-focused field stop and has a blue ring around the edge of the field near the edge.
Any of you see the same thing?




Maybe your eyepiece does not have field stop, like one ES9-120 reported to be 140 degrees?
Jochsner mentions clean and sharp field stop.


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JMW
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: pbsastro]
      #5613834 - 01/09/13 02:31 PM

It is the third most expensive eyepiece in my collection. It is the heaviest and you can see from my picture that it is still a pretty big eyepiece.

I wouldn't say 'small, light and cheap'. Definitely smaller, lighter, cheaper' than the 30mm with 3 inch barrel. My TEC-140 is the only scope I have that has a focuser that could use a 3 inch eyepiece. I think the market will be pretty small for the 30mm 100 degree eyepiece.


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Shneor
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: Manish]
      #5614001 - 01/09/13 04:15 PM

Quote:

>>How big is the eyelens? Any photos?

33mm (1.3").

We have several photos and some additional specs up on our website.
http://agenaastro.com/explore-scientific-100-deg-series-eyepiece-25mm.html

Regards,
Manish
www.AgenaAstro.com



Hi Manish,
Any info on the field stop? I noticed that there's no photo of the field lens on yur site.

Clears,


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DRodrigues
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ES 25mm 100 AFOV ER new [Re: Shneor]
      #5614364 - 01/09/13 07:38 PM

The values of eye-relief mentioned seem to indicate that this is the ES100 more user friendly to eye-glass users like me. Can someone please compare the useful ER with the one of Ethos 17?
I'm also interested of knowing if this ep shows much lateral colour during the day - this ep might be the best solution for day-light low power wide field fanatics, unlike me since I'm a high power wide field fanatic...
The ES120 9mm seems to show too much lateral colour on day-light use but with the reduced ER also wasn't for me...


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MitchAlsup
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Re: ES 25mm 100 AFOV ER new [Re: DRodrigues]
      #5614686 - 01/09/13 11:15 PM

I added one to my collection tonight. Thanks for the AgenaAstro link.

Since I have a 9ES120 I will be able to compare and relate the blue flame at the edge. I have been waiting for this thiing to finally arrive to cycle out my 31NT5 in my F/4 for a smaller exit pupil. I will let you know how this goes. If it is anything lke the 9ES120 its going to be superb.


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Starman1
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Re: ES 25mm 100 AFOV Shipped (Pictures) new [Re: pbsastro]
      #5614738 - 01/10/13 12:01 AM

Quote:

Quote:

I notice the example I have doesn't have a sharply-focused field stop and has a blue ring around the edge of the field near the edge.
Any of you see the same thing?




Maybe your eyepiece does not have field stop, like one ES9-120 reported to be 140 degrees?
Jochsner mentions clean and sharp field stop.




Too bad the others were already sent out or I'd compare them.
It's completely overcast here tonight or I'd see what's up.


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FastMike
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Re: ES 25mm 100 AFOV Shipped new [Re: JMW]
      #5615313 - 01/10/13 11:26 AM Attachment (71 downloads)

Here is a picture of the field lens.

I measured the lens to be about 41.5mm wide using a digital caliper. The reading is not 100% accurate because I hovered the caliper over the lens and eyeballed it to avoid scratching the lens.

Hopefully it will work well in my NP101 but haven't tried it yet.


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Starman1
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Re: ES 25mm 100 AFOV Shipped new [Re: FastMike]
      #5615383 - 01/10/13 12:01 PM

If the bottom lens assembly is negative, then the field stop for the eyepiece is going to be internal.
And probably not measurable easily.
You can time the passage of a star on the equator to get an idea of the true field.
And you can back into the size of the field stop by converting the true field to degrees (with decimals) and using the following formula:

Field Stop = (True Field X Telescope focal length) / 57.3

It will be not the actual field stop, but the derived field stop, and useful for TFOV guesses in different scopes.


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Shneor
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Re: ES 25mm 100 AFOV Shipped new [Re: Starman1]
      #5615819 - 01/10/13 04:17 PM

Got a shipping notice from Astronomics.

Clears,


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Dick Jacobson
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Re: ES 25mm 100 AFOV Shipped new [Re: Starman1]
      #5615821 - 01/10/13 04:18 PM

Another way to approximate the Field Stop is to multiply the eyepiece focal length by the apparent field, and divide by 60. There is also the Field Stop Calculator which produces an estimate of 40.8 mm for this eyepiece.

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Starman1
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Re: ES 25mm 100 AFOV Shipped new [Re: Starman1]
      #5615832 - 01/10/13 04:23 PM

Brief look with the 25mm through a TeleVue NP101 today as a daytime spotting scope with wide flat field, producing 22X.
Comments about the 25mm:
--field doesn't appear any larger than 100 degrees. Maybe a little less. I'll have to time a star to find out.
--almost parfocal with TeleVue 24mm Panoptic in a High-Hat adapter.
--when eye is a little too far back, there is a profound yellow-orange ring around the outside 25% of the field. At the proper exit pupil (it feels tight), the very edge of the field (maybe 5%) has a slight yellowish tint, but it's minor--not like a color filter of any kind.
--the exit pupil is definitely too tight for glasses to be worn and too tight for a DioptRx-style lens to be added to the eyepiece.
--The very edge of the field (1 degree of field max) shows a sharply blue thin ring. There is a way to hold the eye to reduce the thin ring to just the very edge but it is visible with direct or peripheral vision.
--the field stop is NOT in focus when the eyepiece is. Wearing reading glasses did not help. It's close, but not exact.
--the image was quite sharp, on a par with the 24 Panoptic.
--the edge of the field has serious rectilinear distortion (as expected)--much more significant than the much narrower 24 Panoptic (as expected).
--the image was fairly sharp right near the edge.
--there is vignetting in the last 5-10 degrees of field at the edge. It is not significant in daytime use. It is visible with peripheral or direct vision. I've seen eyepieces with worse.
--I could not notice any angular magnification distortion or astigmatism. That will have to wait for nighttime use. However, most binoculars with much narrower fields have some of both, so this is obviously an eyepiece aimed at astronomers.

This is not an eyepiece likely to be used as a daytime eyepiece, but the colors near the edge and vignetting were more likely to be visible in daytime use, so I'm reporting here. So far, I'm encouraged by what I see that this could be a very nice astronomical-use eyepiece.


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Fred1
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Re: ES 25mm 100 AFOV Shipped new [Re: Dick Jacobson]
      #5616311 - 01/10/13 09:36 PM

Quote:

Another way to approximate the Field Stop is to multiply the eyepiece focal length by the apparent field, and divide by 60. There is also the Field Stop Calculator which produces an estimate of 40.8 mm for this eyepiece.




Interesting. The N.A.A. Telescope Math Calculator says 43.6mm. Scroll down after entering your scope specs to see the FS value.


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Tamiji Homma
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Re: ES 25mm 100 AFOV Shipped new [Re: Fred1]
      #5619350 - 01/12/13 04:06 PM

I measured TFOV and calculated field stop of ES25-100 along with Nagler 31T5.

41.1mm ES25-100 (last 1% vignetting/fuzzy field stop)
42.2mm Nagler 31T5 (clean to the very edge)

Tammy


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mountain monk
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Re: ES 25mm 100 AFOV Shipped new [Re: Tamiji Homma]
      #5620039 - 01/12/13 11:54 PM

Tammy,

Thank you for that post. Since I have the 31mm Nagler, I don't even have to think about the ES 25!

Dark skies.

Jack


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Astrojensen
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Re: ES 25mm 100 AFOV Shipped new [Re: mountain monk]
      #5620159 - 01/13/13 03:22 AM

Quote:

Since I have the 31mm Nagler, I don't even have to think about the ES 25!




Maybe not and maybe yes. I don't think the reason to get a 100° eyepiece should be to get a bigger true field, but to get a bigger true field in that given focal length. I can personally attest that the increase in apparent field of view can be most impressive and clearly worth upgrading to, if you can afford it. I couldn't so I went with some 82° ES eyepieces, since I could get three really useful focal lengths for the price of one 100° eyepiece. But I'd still like to have a couple 100° eyepieces. They sure are intoxicating, much like binoviewers.


Clear skies!
Thomas, Denmark


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Dick Jacobson
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Re: ES 25mm 100 AFOV Shipped new [Re: Astrojensen]
      #5620347 - 01/13/13 09:27 AM

Quote:

Quote:

Since I have the 31mm Nagler, I don't even have to think about the ES 25!




Maybe not and maybe yes. I don't think the reason to get a 100° eyepiece should be to get a bigger true field, but to get a bigger true field in that given focal length. I can personally attest that the increase in apparent field of view can be most impressive and clearly worth upgrading to, if you can afford it. I couldn't so I went with some 82° ES eyepieces, since I could get three really useful focal lengths for the price of one 100° eyepiece. But I'd still like to have a couple 100° eyepieces. They sure are intoxicating, much like binoviewers.


Clear skies!
Thomas, Denmark



Another reason to prefer the ES 25/100 is that it has a smaller exit pupil, meaning that for many people the stars will be brighter. If you have an f/5 scope, the 31mm Nagler gives an exit pupil diameter of 31/5 = 6.2mm so a substantial amount of light is wasted if you're a typical middle-aged person with 5mm pupils. As I see it, the ES 25/100 is the only eyepiece in existence that delivers nearly all of the light that enters a 2" drawtube into your eye (again, for the f/5, 5mm pupil case).

Astrojensen, I have a binoviewer and a couple of 100° eyepieces, and I agree 100% they are intoxicating!


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Tamiji Homma
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Re: ES 25mm 100 AFOV Shipped new [Re: mountain monk]
      #5620878 - 01/13/13 02:07 PM

Hi Jack,

You're welcome. Field stop size of ES25-100 was one of interest as well.
I uploaded closeup ES25-100 photo of side-by-side with Nagler 31T5.

Regarding visual experience, I have nothing to add beyond Don described earlier. I agree with him in all accounts.

ES25-100 needs about 2.8mm Inward focus distance lesser than N31T5 but if your diagonal 2" holder hits bottom, you loose the advantage. It happened with Baader 2" diagonal. Astro Physics MaxBright was OK. I mean nosepiece went in all the way.


Field lens side, trying to show blue fuzzy field stop that people are talking about:


Eye lens side:


Upper body shot:


Tammy


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mountain monk
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Re: ES 25mm 100 AFOV Shipped new [Re: Tamiji Homma]
      #5621040 - 01/13/13 03:17 PM

Thomas,

I understand the infatuation with 100 degrees. I have four Ethoi---17mm, 13mm, 8mm, and 6mm--and they have provided me with an enormous amount of pleasure in my scopes. I do not have have the extraordinary amount of knowledge you all display here on CN, but I can report that none of the above spends more time in the focusers than the 31mm Nagler. For me, it is the magical eyepiece, though the 13mm is close...

Dark skies.

Jack


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Starman81
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Re: ES 25mm 100 AFOV Shipped new [Re: mountain monk]
      #5621141 - 01/13/13 04:16 PM

Thanks for the visuals Tamiji. It definitely looks like a very impressive eyepiece, however the blue fuzzy field stop is quite apparent, even in the photo.

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Shneor
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Re: ES 25mm 100 AFOV Shipped new [Re: mountain monk]
      #5621159 - 01/13/13 04:26 PM

Got mine yesterday, an hour before I left for Lake Sonoma. Transparency was mediocre, on average, but varied from poor to fair. Getting this eyepiece shortly before I left contributed to my neglecting to swap my regular contact lenses for my observing set (meaning my distance vision was not as good, so fainter stars I could ordinarily see became invisible to me). A fellow observer's 24" barely showed a 15th magnitude galaxy.

Nevertheless, this was first light for my new eyepiece. I was pleasantly surprised by the apparent lack of come - only to realize (as another observer pointed out) that the designers had cleverly used another optical aberration to correct for coma - field curvature. Of course, this is noticeable only when panning the eyepiece, so it's a nice compromise. In my 22" f/4, this eyepiece gives a true field of one degree six arcminutes (1.1°). Even though conditions were poor, this eyepiece let me view several galaxies in the Fornax cluster at the same time, requiring less panning. Contrast was good, but it's hard to determine due to the absence of good transparency. The view of M42 with an NPB filter was stunning - the extended view of the nebulosity was amazing. And some bright galaxy trios looked good. but Markarian's chain looked better in my 20mm ES100°.

Incidentally, I believe the field stop is not internal.

Clears,


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Starman1
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Re: ES 25mm 100 AFOV Shipped new [Re: Shneor]
      #5621285 - 01/13/13 05:29 PM

Shneor,
This eyepiece is NOT coma-corrected. I only got a chance to look at the Perseus Double Cluster with my 12.5" f/5. The eyepiece performed fine in the Paracorr, and the predominant aberration visible without the coma corrector was.....coma.
That coma may have been combined with field curvature and astigmatism to bloat the amount of visible coma, but there it was.
Eyepieces, except for a couple 50 degree samples from the "80s, are not coma-corrected. And note that an eyepiece can have field curvature without correcting for coma in the scope, and vice-versa.

Edited by Starman1 (01/13/13 05:30 PM)


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Shneor
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Re: ES 25mm 100 AFOV Shipped new [Re: Starman1]
      #5621339 - 01/13/13 05:58 PM

Don, stars were pretty sharp to near the edge. I'm not the only one who saw this. The field curvature was obvious, and it appeared to offset coma to a significant degree.

In general, if it's only my eyes, I won't post. In this case, a very experienced observer noted the apparent correction.

Clears,


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Starman1
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Re: ES 25mm 100 AFOV Shipped new [Re: Shneor]
      #5621577 - 01/13/13 08:20 PM

What do you mean when you say field curvature offset coma?
Field curvature slowly defocuses the star images, but they stay round. Coma stretches the star images radially into fan shapes.
Field curvature can defocus coma, too, making the comatic image slightly larger and out of focus, but it doesn't reduce coma. It can only make the appearance of it worse.
So what you say cannot be reconciled.
I notice a slight amount of astigmatism near the edge, and depending on which side of focus you sit, this could appear to reduce the radial width of the comatic star (while stretching it circumferentially). On the other side of focus, it would make it worse.
I got a quick glance at the Perseus Double Cluster with the eyepiece in a Paracorr II, and the star images displayed a trace of astigmatism, but no obvious coma or field curvature. Since the Paracorr corrects the last two, it's not surprising what I saw. Without the Paracorr, it displayed the normal amount of coma for an f/5 scope and a 100 degree field, i.e. a lot.
However, if the eyepiece actually corrected coma, it would display coma in the Paracorr, and it did not.
Once again, current eyepieces do not correct for coma. If they did, they'd only be useful in short f/ratio newtonians.

Edit:
It just dawned on me that what you are calling field curvature is actually rectilinear distortion (wherein straight lines appear curved near the edge of the field, so ||| becomes )|( in the eyepiece.
Yes, the eyepiece has a lot of that, as do other 100 degree eyepieces.
The correction of RD is impossible in a widefield eyepiece without leaving in tons of Angular Magnification Distortion (AMD), which is considered to be the more deleterious form of distortion in astronomical viewing.
RD is more noticeable when panning quickly, but usually doesn't bother most observers.
AMD, on the other hand, distorts images terribly, so most modern designers opt for RD over AMD.

Field curvature is when the focal plane is curved toward or away from the eye at the edge and it results in out of focus stars. I don't think that was what you were talking about.

Edited by Starman1 (01/13/13 08:26 PM)


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herrointment
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Re: ES 25mm 100 AFOV Shipped new [Re: Starman1]
      #5621887 - 01/13/13 11:08 PM Attachment (82 downloads)

I'll contribute my usual *BLEEP* photo....

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MRNUTTY
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Re: ES 25mm 100 AFOV Shipped new [Re: herrointment]
      #5622179 - 01/14/13 06:50 AM

Vundabar! Herr Ointment! I'm still waiting...

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herrointment
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Re: ES 25mm 100 AFOV Shipped new [Re: MRNUTTY]
      #5622830 - 01/14/13 02:59 PM

Ja, sehr gut!

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JMorey
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Re: ES 25mm 100 AFOV Shipped new [Re: JMW]
      #5622842 - 01/14/13 03:03 PM

Hi Guys,

I had a thought: Being that the ES 30mm 2" 82 degree eyepiece has six elements, and the ES 25mm 2" 100 degree eyepiece has eight elements would there actually be that much of a difference in magnitude because of the two extra elements in the ES 25mm? There true field of view is almost the same. I think it would be interesting to hear a report concerned with both eyepieces, and the differences noted in coatings on the eyepieces. Any thoughts? Thanks much, and clear skies.

Best,
Joe


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herrointment
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Re: ES 25mm 100 AFOV Shipped new [Re: JMorey]
      #5622860 - 01/14/13 03:14 PM

Mine won't see any action 'till sometime next month by the looks of it.

The weather has been ridiculously uncooperative for longer than I care to recall.


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Astrojensen
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Re: ES 25mm 100 AFOV Shipped new [Re: herrointment]
      #5622892 - 01/14/13 03:32 PM

Sounds like around here. Ever since I ordered my ES eyepieces on December 23rd, it's been completely overcast. And the very day I received them, it started snowing. It's been cold and snowy since. Just got another two inches while I was eating dinner...

Those eyepieces must be ridiculously good!!!


Clear skies!
Thomas, Denmark


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Phillip Creed
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Re: ES 25mm 100 AFOV Shipped new [Re: Tamiji Homma]
      #5622905 - 01/14/13 03:38 PM

Quote:

I measured TFOV and calculated field stop of ES25-100 along with Nagler 31T5.

41.1mm ES25-100 (last 1% vignetting/fuzzy field stop)
42.2mm Nagler 31T5 (clean to the very edge)

Tammy




I'm a bit surprised that the 31T5 has a bigger field stop. I would have guessed the opposite, even assuming there was a fair bit of pincushion distortion.

Clear Skies,
Phil


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Darren Drake
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Re: ES 25mm 100 AFOV Shipped new [Re: Phillip Creed]
      #5622949 - 01/14/13 04:01 PM

Looks like there is some pincushion in the pic. The 9mm looks a little distorted lol.

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herrointment
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Re: ES 25mm 100 AFOV Shipped new [Re: Darren Drake]
      #5622963 - 01/14/13 04:06 PM

Yes, the 9 looks a bit out of sorts although the exact cause is debatable!

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Starman81
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Re: ES 25mm 100 AFOV Shipped new [Re: herrointment]
      #5623118 - 01/14/13 05:33 PM

Jim (herrointment), are you planning on keeping the 20mm now that you have the 25mm? You could probably do without it but then the set would no longer be complete.

Darren, isn't that 'barrel distortion' when the image distorts in a concave sort of way at the edge?


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Starman1
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Re: ES 25mm 100 AFOV Shipped new [Re: Starman81]
      #5623163 - 01/14/13 06:04 PM

Barrel Distortion (Negative rectilinear distortion):

||| becomes (|)

Pincushion Distortion (Positive rectilinear distortion):

||| becomes )|(

Most eyepieces produce pincushion. The picture of the ES eyepieces has barrel distortion.


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herrointment
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Re: ES 25mm 100 AFOV Shipped new [Re: Starman81]
      #5623169 - 01/14/13 06:08 PM

For me, these eyepiece amount to an insane extravagance. My employer decided to keep us busy to the tune of 400+ hours of overtime last year and these Eps are my reward.

If I buy something I tend to hang on to it and so far I'm plenty happy with the 9, 14 and 20.



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thrawn
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Re: ES 25mm 100 AFOV Shipped new [Re: herrointment]
      #5623202 - 01/14/13 06:33 PM

Someone put a tiny piece of tape on that stop near the field lens, and check if it's in focus (or almost in focus) looking through the eye end. Then we'll know for sure if the field stop is external or internal.

I'm not on CN much anymore btw so I may not notice the answer.


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Jobryant
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Re: ES 25mm 100 AFOV Shipped new [Re: thrawn]
      #5624390 - 01/15/13 01:17 PM

Is the rubber eye guard permanently attached or can it be taken off either by unscrewing it or just pulling it off?

So from the reports I've read so far this EP would not be suitable for daytime use. How would it compare to the Ethos 17 when it comes to pincushion distortion or the Nagler 31? I found the Ethos 17 fine to use as a daytime EP. My current daytime EP is the 88deg 30mm Leitz and I love it. I do see distortion(fishbowl effect) but it doesn't bother me. After months of side by side comparisons I actually choose the Leitz over the Pentax XW40 for my daytime viewing to give you idea of my tolerance to pincushion distortion. That being said would the ES25 100 still be considered a bad choice to use as a daytime EP for a guy like me that isn't too sensitive to the distorted fishbowl effect?


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Starman1
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Re: ES 25mm 100 AFOV Shipped new [Re: Jobryant]
      #5624657 - 01/15/13 03:35 PM

Quote:

Is the rubber eye guard permanently attached or can it be taken off either by unscrewing it or just pulling it off?



It pulls right off.
Quote:


So from the reports I've read so far this EP would not be suitable for daytime use. How would it compare to the Ethos 17 when it comes to pincushion distortion or the Nagler 31?




Note that TeleVue's philosophy of design tends to reduce Angular magnification distortion to a minimum in their eyepieces. That means that rectilinear distortion (pincushion is one example) will be present in proportion to the width of the field of view. That means a 31 Nagler would have less than a 17 Ethos. It appears the 25mm has also solved for AMD because RD is noticeable when you look for it. That's good for astronomy.
Quote:


I found the Ethos 17 fine to use as a daytime EP.



So long as the 25mm doesn't produce too big an exit pupil for your daytime eye, you would find it similar.
Quote:


My current daytime EP is the 88deg 30mm Leitz and I love it. I do see distortion(fishbowl effect) but it doesn't bother me. After months of side by side comparisons I actually choose the Leitz over the Pentax XW40 for my daytime viewing to give you idea of my tolerance to pincushion distortion. That being said would the ES25 100 still be considered a bad choice to use as a daytime EP for a guy like me that isn't too sensitive to the distorted fishbowl effect?



Well, RD isn't usually a problem unless you look at fields of view with a lot of linear features (such as trees), or pan the eyepiece rapidly. Of course, AMD would be bad in panning as well because every object would appear to start distant at the edge of the field, get closer in the center and then grow more distant again.
That both forms of distortion would result in something antithetical to distortion-free daytime observing is, in my purview, the primary reason to stick to slightly narrower fields of view in the daytime--the percentages of distortion at the edge of the field would be less.
However, if the distortion doesn't bother you (and for stationary viewing it seldom is obtrusive), then go for the wider field of view.


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Jobryant
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Re: ES 25mm 100 AFOV Shipped new [Re: Starman1]
      #5624686 - 01/15/13 03:49 PM

Thanks Don!

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star drop
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Re: ES 25mm 100 AFOV Shipped new [Re: Tamiji Homma]
      #5626108 - 01/16/13 12:28 PM

Quote:

Hi Jack,

You're welcome. Field stop size of ES25-100 was one of interest as well.
I uploaded closeup ES25-100 photo of side-by-side with Nagler 31T5.

Regarding visual experience, I have nothing to add beyond Don described earlier. I agree with him in all accounts.

ES25-100 needs about 2.8mm Inward focus distance lesser than N31T5 but if your diagonal 2" holder hits bottom, you loose the advantage. It happened with Baader 2" diagonal. Astro Physics MaxBright was OK. I mean nosepiece went in all the way.


Field lens side, trying to show blue fuzzy field stop that people are talking about:


Eye lens side:


Upper body shot:


Tammy



There is a blue ring at the field stop for the 20, 14 and 9mm versions as viewed under similar conditions. It gets harder to see as the focal length decreases.


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MRNUTTY
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Re: ES 25mm 100 AFOV Shipped new [Re: star drop]
      #5626203 - 01/16/13 01:26 PM

Welp, I canceled the pre-order I had at one vendor and bought the ES100/25 from eyepiecesetc.com (thanks Don)! I just couldn't wait any longer!

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Doug Culbertson
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Re: ES 25mm 100 AFOV Shipped new [Re: MRNUTTY]
      #5626217 - 01/16/13 01:40 PM

Quote:

Welp, I canceled the pre-order I had at one vendor and bought the ES100/25 from eyepiecesetc.com (thanks Don)! I just couldn't wait any longer!




Thank you! I've been dithering over that one eyepiece at Don's place for days now, but couldn't decide if I wanted to replace the 31mm Nagler. Nice to have the decision made for me.


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MRNUTTY
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Re: ES 25mm 100 AFOV Shipped new [Re: Doug Culbertson]
      #5626256 - 01/16/13 01:59 PM

LOL Doug! You should have said so earlier, I wouldn't have waited so long!

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Doug Culbertson
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Re: ES 25mm 100 AFOV Shipped new [Re: MRNUTTY]
      #5626266 - 01/16/13 02:05 PM

Well, I wasn't so sure that I didn't want it either!

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johnnyha
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Re: ES 25mm 100 AFOV Shipped new [Re: star drop]
      #5626531 - 01/16/13 04:31 PM

Re: the shot showing the blue ring around the field stop - I feel like if the 31T5 was angled just slightly as is the 25 ES 100, the 31T5 might show the same blue ring?

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Starman1
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Re: ES 25mm 100 AFOV Shipped new [Re: MRNUTTY]
      #5626739 - 01/16/13 06:24 PM

Quote:

Welp, I canceled the pre-order I had at one vendor and bought the ES100/25 from eyepiecesetc.com (thanks Don)! I just couldn't wait any longer!



And now I'm on back-order.
Seriously, though, my criticisms of this eyepiece, as seen in some of my prior posts, are really minimal. It seems to perform fine in the focuser, even though the 31 Nagler has a tad more field.
It's not the bargain of the other 100s from ES, but it isn't dramatically over-priced, either.


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Astrojensen
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Re: ES 25mm 100 AFOV Shipped new [Re: Starman1]
      #5627402 - 01/17/13 03:20 AM

Quote:

It's not the bargain of the other 100s from ES, but it isn't dramatically over-priced, either.




Soon, it'll not be $599, but $549. After a while, it'll be $499. Then christmas 2013 comes, and it gets on sale for $399!


Clear skies!
Thomas, Denmark


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Jim Romanski
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Re: ES 25mm 100 AFOV Shipped new [Re: Astrojensen]
      #5627867 - 01/17/13 11:20 AM

Quote:

Quote:

It's not the bargain of the other 100s from ES, but it isn't dramatically over-priced, either.




Soon, it'll not be $599, but $549. After a while, it'll be $499. Then christmas 2013 comes, and it gets on sale for $399!



I kind of doubt that they'll cut the price for this thing that much. My guess is that ES believes they have something that Televue doesn't and so they don't have to slash prices to pickup market share.

It looks like they're using the same pricing with the 9mm 120 degree eyepiece. Even coming from China these eyepieces must be pricey to manufacture.

These two eyepieces allow them to market themselves as starting to be innovators rather than just a company that makes knock-offs.


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faackanders2
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Re: ES 25mm 100 AFOV Shipped new [Re: Astrojensen]
      #5629790 - 01/18/13 11:46 AM

Quote:

Quote:

It's not the bargain of the other 100s from ES, but it isn't dramatically over-priced, either.




Soon, it'll not be $599, but $549. After a while, it'll be $499. Then christmas 2013 comes, and it gets on sale for $399!


Clear skies!
Thomas, Denmark




Seems to be an ES trend to lower prices around XMAS, and to take advantage of initial release higher demand. But let's not forget part of pricing is due to economy and supply and demand. If the economy recovers ES has the option to end (or reduce) the sale. Ending a sale is different than raising the price, although the customer still pays more.


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herrointment
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Re: ES 25mm 100 AFOV Shipped new [Re: faackanders2]
      #5629952 - 01/18/13 01:31 PM

As a set of four you're looking at around 365 per ocular at the current prices. Around about where they should sit in this market(?).

Had the 25mm out for a quick (15 min...clouds) session two nights ago in lousy conditions. It's sharp and like the other three I've got to mash my eyeball right into the eyeguard which I like... no eye placement issues for me at least and no problems with the neighbors lighting that way either. A shadow transit on Jupiter looked good considering and M42 showed layering and more color than I usually pick up.... but this could easily be the CPC 11HD doing its thing.

Possible small window tonight before the next clipper drops the temps into the teens below zero for a week or so.


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MRNUTTY
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Re: ES 25mm 100 AFOV Shipped new [Re: herrointment]
      #5630104 - 01/18/13 03:20 PM

Yet another picture of our favorite ES100! Mine came today from EyepiecesEtc Thanks again Don!!

This one however had different packaging than my other ES100's!

A very cool hard board flip top boasting a star map of vicinity of the Milky Way Core This is THE BEST box I've ever got, almost better than the EP that came in it! In the future, if anyone buys this 2nd hand INSIST on the box.



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rockethead26
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Re: ES 25mm 100 AFOV Shipped new [Re: MRNUTTY]
      #5630235 - 01/18/13 04:36 PM

Classy!

Jeez, lots of photos of the 25, but the crummy weather everywhere is causing a dearth of observing reports.


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Starman1
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Re: ES 25mm 100 AFOV Shipped new [Re: rockethead26]
      #5630288 - 01/18/13 05:31 PM

Of course it's cloudy.

Telescopes, especially new telescopes or telescopes with new eyepieces, emit moistons. Moistons cause the sky to cloud up as water molecules condense around the moistons. If enough moistons are emitted (many new scopes or eyepieces in one area), it will actually rain.

Only the full or near-full moon is bright enough to disperse the moistons, which explains why it's always clear at full moon.


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rockethead26
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Re: ES 25mm 100 AFOV Shipped new [Re: Starman1]
      #5630349 - 01/18/13 06:17 PM



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stratocaster
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Re: ES 25mm 100 AFOV Shipped new [Re: MRNUTTY]
      #5630570 - 01/18/13 08:54 PM

Quote:

Yet another picture of our favorite ES100! Mine came today from EyepiecesEtc Thanks again Don!!




That's some mighty fine looking glass you have there.


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mountain monk
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Re: ES 25mm 100 AFOV Shipped new [Re: stratocaster]
      #5630899 - 01/19/13 12:34 AM

Hmmmm...moistons... Given the number of new scopes and eyepieces purchased by the denizens of <cloudynights.com>, not to mention the used stuff moving around here, it appears that we have met the enemy and he is...US. But if we stop buying, then our great nation will sink into oblivion, not to mention some of our most distinguished members (and our host!), so..buy on. Perhaps one day we will see the sky again.

Dark skies


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smallscopefanLeo
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Re: ES 25mm 100 AFOV Shipped new [Re: mountain monk]
      #5631446 - 01/19/13 12:05 PM

Never mind the stunning eyepiece, I must have that box!!!

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MRNUTTY
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Re: ES 25mm 100 AFOV Shipped new [Re: smallscopefanLeo]
      #5631529 - 01/19/13 12:59 PM

LOL! I guess the box is standard issue now :-) it is slick though compared to the old 'matte black instrument' style box.

Maybe that's why they're all back ordered; lead time on that crazy box!

Edited by MRNUTTY (01/19/13 01:01 PM)


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faackanders2
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Re: ES 25mm 100 AFOV Shipped new [Re: smallscopefanLeo]
      #5632535 - 01/20/13 01:09 AM

I could just see it now. Demand for the old eyepieces is less since it comes in the old black box.

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JMW
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Re: ES 25mm 100 AFOV Shipped new [Re: faackanders2]
      #5641142 - 01/24/13 05:48 PM

I just got back from 4 nights in Death Valley. I was able to observe for 2 nights at Mesquite Springs campground. I did public outreach astronomy for about 30 people the first night and about 15 the 2nd night. There were a lot of scouts and others camping over the 3 day weekend. It was plenty dark for showing the brighter stuff under a 1st quarter moon. The ES25mm 100AFOV eyepiece was used for stuff like M44, M45 and the double cluster. People had no problems with eye placement. After about 3 hours, I set my alarm for 2am and went to bed waiting for the moon to go down.

I spent from 2 to 4 AM enjoying a quite campground with no lights and the moon was down. The 25mm eyepiece was quite useful for scanning the skies. I was using a TEC 140 refractor on a Discmount DM6. It was on a Planet tripod with Losmandy extension. I was able to see Mararian's chain, Leo's triplet and many other galaxies. There was enough of a breeze to chill the air but not enough to bother the scope. The 2nd night I set the alarm for 3am. The wind at that time was too strong so I went back to bed.

I was able to do some back and forth between the ES 25 100 AFOV, the Ethos 21 and Naglar 31T5. There is a lot of overlap between the true field of view of the 31T5 and the ES 25. Both are good eyepieces. If I only used one scope at a time I probably wouldn't own both. Since I am often observing with a 20 inch dob I will keep all of them.

The eyepiece is heavy but it wasn't a problem for my Discmount DM6. I don't think it will mater much on our Obsession 20F5. It may be a problem on an 8-12 inch tube dob.


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Jobryant
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Re: ES 25mm 100 AFOV Shipped new [Re: JMW]
      #5641761 - 01/25/13 12:01 AM

Good report Jeff! So if you happen to only use one scope at a time what EP would you choice to own the 31T5 or the ES 25?

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JMW
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Re: ES 25mm 100 AFOV Shipped new [Re: Jobryant]
      #5643357 - 01/25/13 09:03 PM

I will defer that opinion until I have a chance to try them both out in the Obsession 20F5. That would give me a better idea of how it works in a faster scope. When I was trying identify smaller galaxies the additional magnification with the ES 25 was apparent. I didn't have a chance to look a extremely wide objects such as the North America or Veil nebula.

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faackanders2
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Re: ES 25mm 100 AFOV Shipped new [Re: JMW]
      #5644290 - 01/26/13 12:08 PM

Quote:

I will defer that opinion until I have a chance to try them both out in the Obsession 20F5. That would give me a better idea of how it works in a faster scope. When I was trying identify smaller galaxies the additional magnification with the ES 25 was apparent. I didn't have a chance to look a extremely wide objects such as the North America or Veil nebula.




Thanks for the visual report. I also have 20mm 100AFOV and 30mm 82AFOV eyepieces, and would like to have your opion on the new 25 100AFOV and which you would use more. I would antipate (me) using the 25mm 100 AFOV the most out of the 3 for widest high power view, if I had all three.


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JMW
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Re: ES 25mm 100 AFOV Shipped new [Re: faackanders2]
      #5644696 - 01/26/13 04:38 PM

I am not trying to decide on which one to keep. For me, the ES 25mm 100 AFOV is a keeper along with the 21 Ethos and 31T5 Naglar. I think it is finally time to put my T4 Naglars on the market. I really like the 22T4 and 17T4, less so the 12T4. These were my first 3 Televue eyepieces. I just can't fit them all in my case. It is also getting to be a bit heavy. I may buy a Paracorr type II with the proceeds from selling the T4s. Do you think there is any advantage in trying to sell 3 T4s as a set?

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Astrojensen
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Re: ES 25mm 100 AFOV Shipped new [Re: JMW]
      #5644757 - 01/26/13 05:12 PM

Quote:

Do you think there is any advantage in trying to sell 3 T4s as a set?




Very likely not. You almost have to sell the set at a somewhat lower price than if you sell them individually, since nearly all people aren't interested in all three focal lengths, but only one of them, maybe two. If there's someone out there looking for them all, he will contact you anyway and you might be able to make him a better deal, since you will only have to send one package, instead of three, thereby cutting your expenses and trouble.

But I think you'll be able to sell them much faster, if you sell them individually.


Clear skies!
Thomas, Denmark


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plav1959
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Re: ES 25mm 100 AFOV Shipped new [Re: Astrojensen]
      #5644805 - 01/26/13 05:46 PM

You may have an issue selling as a set, but the good news is they should sell very quickly. I put a 22T4 and a 12T4 on AM and they were both sold within a couple of hours. I'll be very interested to hear how the 25 does in your dob, both with and without a type II paracorr.

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MRNUTTY
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Re: ES 25mm 100 AFOV Shipped new [Re: plav1959]
      #5645006 - 01/26/13 07:49 PM

I got that 24T4 ;-)

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Shneor
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Re: ES 25mm 100 AFOV Shipped new [Re: Starman1]
      #5652871 - 01/30/13 05:55 PM

Quote:

What do you mean when you say field curvature offset coma?
Field curvature slowly defocuses the star images, but they stay round. Coma stretches the star images radially into fan shapes.
Field curvature can defocus coma, too, making the comatic image slightly larger and out of focus, but it doesn't reduce coma. It can only make the appearance of it worse.
So what you say cannot be reconciled.
I notice a slight amount of astigmatism near the edge, and depending on which side of focus you sit, this could appear to reduce the radial width of the comatic star (while stretching it circumferentially). On the other side of focus, it would make it worse.
I got a quick glance at the Perseus Double Cluster with the eyepiece in a Paracorr II, and the star images displayed a trace of astigmatism, but no obvious coma or field curvature. Since the Paracorr corrects the last two, it's not surprising what I saw. Without the Paracorr, it displayed the normal amount of coma for an f/5 scope and a 100 degree field, i.e. a lot.
However, if the eyepiece actually corrected coma, it would display coma in the Paracorr, and it did not.
Once again, current eyepieces do not correct for coma. If they did, they'd only be useful in short f/ratio newtonians.

Edit:
It just dawned on me that what you are calling field curvature is actually rectilinear distortion (wherein straight lines appear curved near the edge of the field, so ||| becomes )|( in the eyepiece.
Yes, the eyepiece has a lot of that, as do other 100 degree eyepieces.
The correction of RD is impossible in a widefield eyepiece without leaving in tons of Angular Magnification Distortion (AMD), which is considered to be the more deleterious form of distortion in astronomical viewing.
RD is more noticeable when panning quickly, but usually doesn't bother most observers.
AMD, on the other hand, distorts images terribly, so most modern designers opt for RD over AMD.

Field curvature is when the focal plane is curved toward or away from the eye at the edge and it results in out of focus stars. I don't think that was what you were talking about.



Hi Don,
Sorry to take so long to respond, the flu laid me low for almost a couple of weeks, and I lost interest in almost everything.

I think you are correct in describing the distortion. I don't claim it was planned, but in an area roughly 60-90% of the radius, coma seemed to be less than it ought to be.
If the weather cooperates, I'll check it out again this weekend. Last time, I neglected to change to my observing contact lenses, and that may also have affected the view. The distortion was obvious when panning, however.

Clears,


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Scanning4Comets
Markus
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Reged: 12/26/04

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Re: ES 25mm 100 AFOV Shipped new [Re: Shneor]
      #5652911 - 01/30/13 06:11 PM

Quote:

I am not trying to decide on which one to keep. For me, the ES 25mm 100 AFOV is a keeper along with the 21 Ethos and 31T5 Naglar. I think it is finally time to put my T4 Naglars on the market. I really like the 22T4 and 17T4, less so the 12T4. These were my first 3 Televue eyepieces. I just can't fit them all in my case. It is also getting to be a bit heavy. I may buy a Paracorr type II with the proceeds from selling the T4s. Do you think there is any advantage in trying to sell 3 T4s as a set?

--------------------
Jeff




Jeff,

Why would you keep all three considering they are all so close in focal length?


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JMW
Pooh-Bah


Reged: 02/11/07

Loc: Nevada
Re: ES 25mm 100 AFOV Shipped new [Re: Scanning4Comets]
      #5653229 - 01/30/13 09:18 PM

I almost always take two scopes to view at dark sites. Sometimes I will also set up a C11 EdgeHD along with the dob and refractor. Most of my viewing is with my 17mm or longer eyepieces. I only go shorter to look at planets or planetary nebula. There is a big difference from the 21 Ethos and Nagler 31T5 so I don't think they are redundant. It will take a summer of viewing before I would make any decision regarding pruning any eyepieces other than my T4 Naglers. I have a Pelican 1550 case and store my eyepieces standing up so I do have a lot of room.

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Jobryant
sage


Reged: 01/13/09

Re: ES 25mm 100 AFOV Shipped new [Re: JMW]
      #5716281 - 03/06/13 12:18 PM

Well I couldn't resist and I had to order me one of these ES25100s. I placed my order from Atronomics on March 1st and received it in the mail yesterday March 5th.

First thing is I really like the cool box the EP came in it's awesome. Unfortunately while I was admiring mine I noticed it was damaged a bit. Normally I wouldn't care too much about the condition of the box but with such a nice looking box like this one I must admit I was pretty bummed when I found the flaw.

The main reason for acquiring this EP is to see if I could use it for my daytime viewings. The allure of viewing with a 25mm 100 degree EP during the day was too much for me to resist even after reading all the early reports suggesting it will probably not work very well for terrestrial viewing. I'll be comparing it against my current daytime champ the 30mm Leitz. I really like the Leitz so in order for me to keep the 25mm ES it will need to perform very well. Side note all the testing was done during the day.

So far I've only been able to use the new EP for about an hour and my initial gut feeling is that I won't be using the ES25100 as a daytime EP. Reason being is that during this short time I already think that the distortion will more than likely be too great for me to overcome. Normally I can handle distortion very well but the amount in the ES25100 is pushing it for me. I felt that I got a bit light headed after viewing with it so no matter how good the EP is if it makes me sick I won't be using it. Hopefully I will get use to looking through a fishbowl without loosing my lunch.

These first impressions are just that and I'll need more time viewing with the EP before making my final decision. With that being said here are a few other things I noticed so far.

In my 50mm F5.6 and 114mm F5.3 refractors curvature was noticeably present. When focusing on axis I'd say about 80% looked in really sharp and in focus at one time. When focusing more towards the outer 1/3rd of the FOV my eyes of 36 years were able to barely overcome the majority of the curvature and I was able to get sharp focus across the entire FOV. The Leitz was the better EP when it came to curvature. More testing is needed to see if coma is present or not.

I felt the on axis sharpness was great on par with the Leitz which is excellent on axis. Color and contrast looked great but I definitely need more time testing this because I was more concentrating on checking the sharpness of the EP then anything else.

I must say I was pleasantly surprised how comfortable the EP was in regards to eye relief, eye placement and lack of blackouts. All these features came together really well for me. I was able to see the entire 100 degrees without nearly as many blackouts as I initially thought I would experience. Yes I did need to tilt my head a bit to see the edges but it was very naturally feeling and not awkward at all for me to do. Even though eye placement to prevent blackouts was fairly easy for me to obtain and hold I found that there seems to be an eye placement sweet spot that was very hard for my to achieve but once found I noticed a reduction in the color fringing seen around the edges.

So far I prefer to remove the rubber eye guard while viewing. The rubber eye guard does in fact feel soft and comfortable against your skin so that's not a issue. I've never like using the eye guards no matter what EP is the reason for me not using the eye guard.

Well that's about it for now. Overall I feel it's a great EP but like others mentioned before me probably not going to be a favorite for terrestrial viewers.


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Rinaldo
Pooh-Bah


Reged: 06/28/04

Loc: Lawng-eye-lind - New York, USA
Re: ES 25mm 100 AFOV Shipped new [Re: Jobryant]
      #5717156 - 03/06/13 07:54 PM

That box is GREAT!

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star drop
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Re: ES 25mm 100 AFOV Shipped new [Re: Rinaldo]
      #5718048 - 03/07/13 10:19 AM

The heck with the eyepiece. Let's play with the box?

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DRodrigues
super member


Reged: 08/08/11

Re: ES 25mm 100 AFOV Shipped new [Re: Jobryant]
      #5769419 - 03/31/13 06:13 PM

Quote:


So far I've only been able to use the new EP for about an hour and my initial gut feeling is that I won't be using the ES25100 as a daytime EP. Reason being is that during this short time I already think that the distortion will more than likely be too great for me to overcome. Normally I can handle distortion very well but the amount in the ES25100 is pushing it for me. I felt that I got a bit light headed after viewing with it so no matter how good the EP is if it makes me sick I won't be using it. Hopefully I will get use to looking through a fishbowl without loosing my lunch.




Jobryant, did you got used to this ep for daylight use?
Did you ever used an Ethos 21 or 17, for daylight use? If so, how do you compare those to the ES100 25?
I use an Ethos 17 for my cr-birding http://www.pt-ducks.com/cr-telescopes.htm#Test%20of%2082%C2%BA,%20100%C2%BA%20and%20102%C2%BA%20AFOV%20zooms and love it...


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davidpitre
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Reged: 05/10/05

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Re: ES 25mm 100 AFOV Shipped new [Re: JMW]
      #5769569 - 03/31/13 07:45 PM

Quote:

I will defer that opinion until I have a chance to try them both out in the Obsession 20F5.




I don't know if you know your fully dilated pupil size, but for me the 31 Nagler would not be my choice for a 20" f/5 , as it gives about a 6.5mm exit pupil. This is larger than many older eyes can accommodate. At 5.1mm the ES 25mm seems more useable.


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Fred1
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Reged: 09/19/07

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Re: ES 25mm 100 AFOV Shipped new [Re: davidpitre]
      #5770500 - 04/01/13 11:00 AM

Has anyone determined the Paracorr setting for the ES 25mm 100°? I fiddled with it some in a friend's 16" f/4.2 as I haven't had a chance to try it in my own scope, yet. Seemed the C or D setting was getting it close. I think B was best for my ES 9mm 100°. Comments?

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Starman1
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Reged: 06/24/03

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Re: ES 25mm 100 AFOV Shipped new [Re: Fred1]
      #5770522 - 04/01/13 11:14 AM

Quote:

Has anyone determined the Paracorr setting for the ES 25mm 100°? I fiddled with it some in a friend's 16" f/4.2 as I haven't had a chance to try it in my own scope, yet. Seemed the C or D setting was getting it close. I think B was best for my ES 9mm 100°. Comments?



You can figure it out easily.
Put in an eyepiece for which you know the correct setting of the Paracorr.
Focus the telescope with the Paracorr set to the correct setting for that eyepiece.
Remove the eyepiece and insert the 25mm.
Focus using the tunable top of the Paracorr, not the focuser knobs.
When the eyepiece is in focus, that is the correct setting of the Paracorr for that eyepiece.
Make a note of it and that will be the setting you select before inserting the 25mm the next time.
You may have to make a tiny focuser adjustment to get perfect focus, but this principle works for all eyepiece that have a proper setting within the range of the Paracorr's tunable top (and 99%+ do).
The only thing required is 1 eyepiece for which you know the correct setting of the Paracorr, and you can determine that by trial and error by using every setting of the Paracorr and focusing then looking at the edge of the field and picking the setting that is best corrected (and it can even be done with the stars slightly out of focus).


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Fred1
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Reged: 09/19/07

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Re: ES 25mm 100 AFOV Shipped new [Re: Starman1]
      #5771176 - 04/01/13 04:45 PM

Thanks, Don. That's what I did, but perhaps it's the rectilinear distortion of the EP (plus my own slight astigmatism) that's having me waffle between C and D. I used a 24mm Pan set to D and focused before inserting the ES 25mm. I should be able to spend more time on it Wednesday night when I'm out with my 18".

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Jobryant
sage


Reged: 01/13/09

Re: ES 25mm 100 AFOV Shipped new [Re: DRodrigues]
      #5771954 - 04/01/13 11:21 PM

Yes I only tested it out during the day. I probably would have kept it if it had been a bit more digiscoping friendly. I've have used a 17mm Ethos for my daytime viewing but that was a few years ago with a different scope. I really liked the Ethos during the day and the only reason why I got rid of it was the magnification was too much for my liking. I prefer mags no higher then 20x.

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Fred1
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Re: ES 25mm 100 AFOV Shipped new [Re: Fred1]
      #5774945 - 04/03/13 09:08 AM

Quote:

Thanks, Don. That's what I did, but perhaps it's the rectilinear distortion of the EP (plus my own slight astigmatism) that's having me waffle between C and D. I used a 24mm Pan set to D and focused before inserting the ES 25mm. I should be able to spend more time on it Wednesday night when I'm out with my 18".




It's setting B same with the 9mm and 20mm ES 100° eps. The 20mm and 25mm are roughly parfocal, the 9mm is not. BTW, I REALLY like the 25mm. I believe it will be my most used wide field ep. Same TFOV a my TV 31mmNT5 but with a more comfortable exit pupil, slightly better contrast with darker background. My first night with it was superb with not nearly as much outer field distortion as I expected. it's really a non-issue for me. Although the Orion Nebula was setting and it was still twilight the E and F stars were readily visible with plenty of detail in the nebula. NO filter in play. It's a keeper. Best SQM reading last night where I was was 5.56 NELM. Should be able to get to a darker site tonight with at least 6.0 skies.


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JimMo
I'd Rather Do It Myself


Reged: 01/08/07

Loc: Under the SE Michigan lightdom...
Re: ES 25mm 100 AFOV Shipped new [Re: Fred1]
      #5775906 - 04/03/13 04:13 PM

Quote:

BTW, I REALLY like the 25mm. I believe it will be my most used wide field ep. Same TFOV a my TV 31mmNT5 but with a more comfortable exit pupil, slightly better contrast with darker background.




I appreciate this statement as I just reluctantly traded my venerable 31T5 for an ES 25/100 for the same reasons. I can't afford to have both at once so I hope my experience mimics yours when used in my dob. I hope to have it by Friday in order to take it to our messier marathon this weekend.


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