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Equipment Discussions >> Eyepieces

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Jim7728
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Explore Scientific 3" 30mm Prototype announced!
      #5567554 - 12/12/12 01:06 PM

Explore Scientific 3" 30mm Prototype

That is just sick...


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csa/montana
Den Mama
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Reged: 05/14/05

Loc: montana
Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Jim7728]
      #5567586 - 12/12/12 01:30 PM

Sooo, have you pre-ordered it?

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hottr6
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Jim7728]
      #5567587 - 12/12/12 01:30 PM

The announcement states that the matching diagonal will be threaded for 2" filters.... doesn't this mean that the 3" EP will be vignetted?

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Jim7728
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: csa/montana]
      #5567609 - 12/12/12 01:41 PM

Quote:

Sooo, have you pre-ordered it?




Yeeaaahhh...though I should talk after buying a 21mm Ethos
and still saying to myself: "what have I done, what have I done..."


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astro_baby
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Reged: 06/17/08

Loc: United Kingdom
Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Jim7728]
      #5567694 - 12/12/12 02:20 PM

Wowsa.....

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star drop
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: astro_baby]
      #5567704 - 12/12/12 02:22 PM

It should come with a helium purged balloon to offset its weight.

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frebieAdministrator
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Reged: 04/29/08

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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: hottr6]
      #5567715 - 12/12/12 02:25 PM

Quote:

The announcement states that the matching diagonal will be threaded for 2" filters.... doesn't this mean that the 3" EP will be vignetted?




Scott did some prototype testing in the ES 80mm apo (480mm focal length) with the prototype 2" to 3" diagonal and did not see any vignetting of the 6.25 degree field of view.


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Scanning4Comets
Markus
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Reged: 12/26/04

Re: Explore Scientific 3" 30mm Prototype announced! new [Re: frebie]
      #5567835 - 12/12/12 03:30 PM

@ 7.5 LBs, nooooooooooooo thanks!

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stevetaylor199
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Loc: SE Wisconsin
Re: Explore Scientific 3" 30mm Prototype announced! new [Re: star drop]
      #5567862 - 12/12/12 03:48 PM

Quote:

It should come with a helium purged balloon to offset its weight.




And here I was going to suggest that for $1200, the eyepiece should be purged with something more exotic than plain old argon, like krypton.

Silly me -- krypton's too heavy!

Now, neon, on the other hand....


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bherv
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: stevetaylor199]
      #5567997 - 12/12/12 05:33 PM

We will need 3" focusers for our reflectors, and lots of counterweight.
Barry


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stratocaster
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: bherv]
      #5568028 - 12/12/12 06:00 PM

I was wondering what the target market would be for such a beast.

The only thing that makes sense to me would be for large dobs or SCTs with long focal lengths, as it would be a way to increase the tfov for these scopes. Even so, say for a 2000mm f/l scope the increase in tfov is only .25 degrees over a 30mm 82 degree eyepiece - for around three times the weight of a 30mm 82 and the additional weight of a special diagonal.

And I suspect coma would be problem in the dob. So maybe SCTs are really the only market.

I'm thinking FC would be way too apparent for use in a refractor. Could be wrong, though.

I guess I don't get it.


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Achernar
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Jim7728]
      #5568338 - 12/12/12 09:41 PM

Wow, drop that eyepiece on your foot, and YOU will be going to the emergency room I can't imagine this eyepiece being used on most telescopes simply because of the weight. However, I could see universities and professional observatories buying them for public outreach events.

Taras


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Gord
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: stratocaster]
      #5568346 - 12/12/12 09:44 PM

I can see use in long FL refractors. Would be nice in a 6" f15 or 8" f12/15. The big cats as well. I'm wondering if we could see some 82 or 68 deg options in long focal lengths? But again, really for the big cat/refractor crowd.

Clear skies,


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johnnyha
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: hottr6]
      #5568349 - 12/12/12 09:46 PM

Quote:

The announcement states that the matching diagonal will be threaded for 2" filters.... doesn't this mean that the 3" EP will be vignetted?



To me too, this seems to negate the whole thing. Why not make 3" filters? Or why even the need to go beyond 2" if the 2" filter somehow magically works with the 3" eyepiece?


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Dr Morbius
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: johnnyha]
      #5568438 - 12/12/12 11:10 PM

Great Caeser's Ghost - that is huge!

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jrbarnett
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Jim7728]
      #5568442 - 12/12/12 11:13 PM

Yeah, it'll be here right after the 5.5mm and 25mm 100s.

I'm officially announcing a new, hand-ground 4" 140-degree 37mm eyepiece. Pricing will be $5000 per unit. It will be purged with Californium gas and have 18 elements.

Coming soon...



- Jim


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JayinUT
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: jrbarnett]
      #5568551 - 12/13/12 01:08 AM

Just think, if you put attachments on them you could use them as barbells in the field during the day to work out with. I'll envy on these. Too rich for me.

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Chucky
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: JayinUT]
      #5568743 - 12/13/12 07:10 AM

Every company needs a product that gets talked about big time to increase company visibility and awareness. All the talk and discussion helps generate sales to other lines. Smart marketing.

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faackanders2
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: jrbarnett]
      #5568914 - 12/13/12 10:04 AM

Quote:

Yeah, it'll be here right after the 5.5mm and 25mm 100s.

I'm officially announcing a new, hand-ground 4" 140-degree 37mm eyepiece. Pricing will be $5000 per unit. It will be purged with Californium gas and have 18 elements.

Coming soon...



- Jim




I believe that one would have to be filled with unobtainium.


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Dave Ittner
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: faackanders2]
      #5569000 - 12/13/12 10:49 AM

Quote:


I believe that one would have to be filled with unobtainium.




lol, good one. we'd only have to build a ship and travel to Pandora. no biggie.

http://james-camerons-avatar.wikia.com/wiki/Unobtanium


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Dick Jacobson
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Reged: 12/22/06

Loc: Plymouth, Minnesota, USA
Re: Explore Scientific 3" 30mm Prototype announced! new [Re: faackanders2]
      #5569327 - 12/13/12 01:58 PM

Quote:

I believe that one would have to be filled with unobtainium.



No, it will be filled with Upsidaisium to make it weightless (apologies to Rocky and Bullwinkle).


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MRNUTTY
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Dick Jacobson]
      #5569677 - 12/13/12 06:04 PM

Quote:

Quote:

I believe that one would have to be filled with unobtainium.



No, it will be filled with Upsidaisium to make it weightless (apologies to Rocky and Bullwinkle).




Moose and squirrel!


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Shneor
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Dick Jacobson]
      #5573046 - 12/15/12 07:24 PM

Helium-filled to reduce weight...not that it would help a whole lot.

Clears,


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faackanders2
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Shneor]
      #5573090 - 12/15/12 07:56 PM


Quote:

Make the widest TFOV 3" eyepiece possible for 100 AFOV and 82 AFOV and 70 AFOV, to take full advantage of 3". I don't feel I would ever be able to afford a 120 AFOV max TFOV.

P.S. These may be the eyepieces people will build telescope around (3" refractors, 3" reflectors, and 3" SCTs).



Anybody know what would be the theoretical widest TFOV eyepiece focal length for a 3" diameter 70 AFOV, 82 AFOV, 100 AFOV, and 120 AFOV eyepiece? Also what would be their exit pupils?


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bremms
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: faackanders2]
      #5573273 - 12/15/12 09:36 PM

Good lord when will the EWF eyepiece madness end? $1200 for an eyepiece.. If TV made it it would be $2500. Make it and they will come.....
how about a 50mm 110 degree 4 inch for $10,000... why not.


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MikeBOKC
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: bremms]
      #5573325 - 12/15/12 10:18 PM

I want a 360 degree eyepiece so I can see if anyone is sneaking up behind me.

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faackanders2
Carpal Tunnel


Reged: 03/28/11

Re: Explore Scientific 3" 30mm Prototype announced! new [Re: MikeBOKC]
      #5658831 - 02/02/13 08:06 PM

Has anyone looked through the prototype with a 3" focuser?
How much wider was the TFOV compared to 2"? What type scope dis they look through. I believe some said it may be best for 3" focusers on a refractor.

Will it be at NEAF?


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Scanning4Comets
Markus
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: faackanders2]
      #5658995 - 02/02/13 10:06 PM

Quote:

Good lord when will the EWF eyepiece madness end? $1200 for an eyepiece.. If TV made it it would be $2500. Make it and they will come.....
how about a 50mm 110 degree 4 inch for $10,000... why not.




There's a sucker born every minute.


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pbsastro
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Reged: 03/21/07

Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Scanning4Comets]
      #5660052 - 02/03/13 02:06 PM

Quote:

Quote:

Good lord when will the EWF eyepiece madness end? $1200 for an eyepiece.. If TV made it it would be $2500. Make it and they will come.....
how about a 50mm 110 degree 4 inch for $10,000... why not.




There's a sucker born every minute.




I think a reasonable single eyepiece price is up to about 25% of the OTA price. So a $1k eyepiece in a $4k OTA, or a $10k eyepiece in a $40k OTA seems reasonable to me.


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Astrojensen
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: pbsastro]
      #5660145 - 02/03/13 02:55 PM

Quote:

I think a reasonable single eyepiece price is up to about 25% of the OTA price. So a $1k eyepiece in a $4k OTA, or a $10k eyepiece in a $40k OTA seems reasonable to me.




What if someone gave you the telescope?

Or you found a really nice scope in a used ad, for a really low price?


Clear skies!
Thomas, Denmark


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Jon Isaacs
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Astrojensen]
      #5660582 - 02/03/13 07:02 PM

Quote:

Quote:

I think a reasonable single eyepiece price is up to about 25% of the OTA price. So a $1k eyepiece in a $4k OTA, or a $10k eyepiece in a $40k OTA seems reasonable to me.




What if someone gave you the telescope?

Or you found a really nice scope in a used ad, for a really low price?


Clear skies!
Thomas, Denmark




When there is a 3 inch coma corrector available or if I owned a TAK 106 FSQ and it would come to focus with a 3 inch diagonal (assuming one were available), this might be awesome. The FSQ has a focal length of 530mm so you'd get a 5.6 degree TFoV.

Otherwise...

Jon


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Scanning4Comets
Markus
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Reged: 12/26/04

Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Jon Isaacs]
      #5660593 - 02/03/13 07:11 PM

Quote:

I think a reasonable single eyepiece price is up to about 25% of the OTA price. So a $1k eyepiece in a $4k OTA, or a $10k eyepiece in a $40k OTA seems reasonable to me.




This doesn't make any sense. This still leaves this ridiculously expensive eyepiece out, unless you're Joe Cash.


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Achernar
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Jim7728]
      #5660625 - 02/03/13 07:44 PM

Good lord, drop that eyepiece on your foot and you will be seeing stars, all the way to the emergency room. I'm sure the views are tremendous through it, if the 30mm ES 82 degree eyepiece I tried out last night was any guide anyone looking through one of those will not be able to see the whole FOV without moving their eye around.

Taras


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pbsastro
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Scanning4Comets]
      #5660637 - 02/03/13 07:55 PM

Quote:

Quote:

I think a reasonable single eyepiece price is up to about 25% of the OTA price. So a $1k eyepiece in a $4k OTA, or a $10k eyepiece in a $40k OTA seems reasonable to me.




This doesn't make any sense. This still leaves this ridiculously expensive eyepiece out, unless you're Joe Cash.




??????
It is the same Joe Cash that payed 4x for the OTA. Not counting mount, tripod, etc.
It is the same thing that saying that $5k for some car tires is too expensive. It sure is for a $20k car, but sure is not for a $200k car.
What makes no sense to me is that you see no sense in this.


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northernontario
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: pbsastro]
      #5660654 - 02/03/13 08:09 PM

Oh those silly egg heads in the research department....what will they think of next.

jake


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pbsastro
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: northernontario]
      #5660663 - 02/03/13 08:18 PM

Quote:

Oh those silly egg heads in the research department....what will they think of next.

jake




It is not a research department thing.
This eyepiece has been requested by many for a long time, including me. TV refused to do it. ES is doing it for us. Long live ES!


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pbsastro
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Achernar]
      #5660669 - 02/03/13 08:23 PM

Quote:

anyone looking through one of those will not be able to see the whole FOV without moving their eye around.





Why would it be different from other 100 deg eyepieces?
BTW Markus Ludes looked through it and thought it was excellent, and will be first in line to buy one.


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Pollux556
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: pbsastro]
      #5660813 - 02/03/13 10:09 PM

Quote:


Why would it be different from other 100 deg eyepieces?





30mm !!!

Edited by Pollux556 (02/03/13 10:10 PM)


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Scanning4Comets
Markus
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Pollux556]
      #5660826 - 02/03/13 10:22 PM

Quote:

??????
It is the same Joe Cash that payed 4x for the OTA. Not counting mount, tripod, etc.
It is the same thing that saying that $5k for some car tires is too expensive. It sure is for a $20k car, but sure is not for a $200k car.
What makes no sense to me is that you see no sense in this.




You could have posted what you did in one post, not three. You angry? lol. It's a hobby, calm down.


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Achernar
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: pbsastro]
      #5661310 - 02/04/13 09:00 AM

I've looked through several 100 degree eyepieces, which are more like looking though a spacesuit's visor than peering into an eyepiece. The field of view is too large to see all at one glance, almost like an IMAX theater. That is especially spectacular when cruising the Milky Way.

Taras


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mattyfatz
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Scanning4Comets]
      #5661317 - 02/04/13 09:03 AM

With wider (3") focusers becoming more mainstream, I'm not surprised by this. I'm actually surprised its taken this long. We should have a whole line of these out by now.

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Dick Jacobson
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Reged: 12/22/06

Loc: Plymouth, Minnesota, USA
Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Achernar]
      #5661345 - 02/04/13 09:24 AM

Quote:

I've looked through several 100 degree eyepieces, which are more like looking though a spacesuit's visor than peering into an eyepiece. The field of view is too large to see all at one glance, almost like an IMAX theater. That is especially spectacular when cruising the Milky Way.

Taras



If an 82 eyepiece is like looking out a window in space, a 100 eyepiece is like looking out a domed window! They are spectacular.


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Svezda
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: MikeBOKC]
      #5661365 - 02/04/13 09:35 AM

Quote:

I want a 360 degree eyepiece so I can see if anyone is sneaking up behind me.




You wouldn't need one since if you have the 100 deg/3-inch eyepiece in your scope you likely already have someone sneaking up behind you...


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csrlice12
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Svezda]
      #5661449 - 02/04/13 10:26 AM

Boo!

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dan_h
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Reged: 12/10/07

Re: Explore Scientific 3" 30mm Prototype announced! new [Re: mattyfatz]
      #5661915 - 02/04/13 02:35 PM

Quote:

With wider (3") focusers becoming more mainstream, I'm not surprised by this. I'm actually surprised its taken this long. We should have a whole line of these out by now.




I have heard of three and four inch focusers. Does anyone make a 3" diagonal?

dan


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Levine
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: dan_h]
      #5661941 - 02/04/13 02:52 PM

Quote:

Quote:

With wider (3") focusers becoming more mainstream, I'm not surprised by this. I'm actually surprised its taken this long. We should have a whole line of these out by now.




I have heard of three and four inch focusers. Does anyone make a 3" diagonal?

dan




Sure, Harry Siebert makes 'em. Has done so for years.



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dan_h
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Reged: 12/10/07

Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Levine]
      #5661960 - 02/04/13 03:09 PM

Quote:

Quote:

Quote:

With wider (3") focusers becoming more mainstream, I'm not surprised by this. I'm actually surprised its taken this long. We should have a whole line of these out by now.




I have heard of three and four inch focusers. Does anyone make a 3" diagonal?

dan




Sure, Harry Siebert makes 'em. Has done so for years.






Well, that ups the ante a little. Level 1, 3" diagonal @ $1200, Level 2, 3" diagonal @ $2200.

Also from his web site, 3" diagonal has a 6" optical path. Might be problematic for some.

'Way outta my league.

dan


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Jon Isaacs
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: dan_h]
      #5662014 - 02/04/13 03:39 PM

I still haven't figured out a scope other than the 106 FSQ that would allow this eyepiece to do it's stuff, that is to provide a reasonably well corrected field of view that is wider than existing 100 degree designs.. For wide field scopes you have two choices, Newtonians and refractors. Newtonians have coma, refractors have field curvature...

Jon


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BillP
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Jon Isaacs]
      #5662018 - 02/04/13 03:43 PM

It's a chicken and egg thing...something's gotta come first then the rest will follow

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Astrojensen
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Jon Isaacs]
      #5662114 - 02/04/13 04:52 PM

Quote:

I still haven't figured out a scope other than the 106 FSQ that would allow this eyepiece to do it's stuff, that is to provide a reasonably well corrected field of view that is wider than existing 100 degree designs.. For wide field scopes you have two choices, Newtonians and refractors. Newtonians have coma, refractors have field curvature...




A 30mm 100 eyepiece should work pretty darn well in a 6" f/8 refractor. I can't remember how large the field stop is in the ES 30/100, but I think I recall something like 52mm, which sounds plausible. A bit of quick math says that the edges are going to be much sharper than they are in my WO 72mm f/6 with the ES 30/82, if both eyepieces have an equally flat field.

A 180mm f/7 with a 30mm/100 eyepiece is going to be incredibly fantastic, if my experience with my own ES 30mm/82 is anything to judge by. It'll be like observing visually with a Schmidt-camera telescope! My 150mm f/8 achromat fills almost the whole field in the ES30mm/82 with the tiniest, sharpest imaginable pinpoint stars.

The ES 30mm/100 eyepiece is going to be something truly special with a refractor with a focal length of 1200mm or longer (perhaps even a 1000mm focal length), used under a dark sky. Once the first experienced deep-sky observers begin to rave about how extreme the views are, then other will become interested as well. If it weren't so darn expensive, I would have preordered it by now, now that I have seen how good the ES 30mm/82 really is.


Clear skies!
Thomas, Denmark


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Achernar
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Astrojensen]
      #5662265 - 02/04/13 06:28 PM

I had a chance to try out a 30mm ES 82 degree eyepiece last Saturday night in my 15-inch. As usual, I was using a Paracorr. The stars were pinpoints across the field and M-81 and M-82 looked really good. It was big, but posed no problem for my 15-inch Dob's balance. I suppose once I get back to work and caught up, I'll buy one.

Taras


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Jon Isaacs
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Astrojensen]
      #5662294 - 02/04/13 06:51 PM

Quote:


A 30mm 100 eyepiece should work pretty darn well in a 6" f/8 refractor. I can't remember how large the field stop is in the ES 30/100, but I think I recall something like 52mm, which sounds plausible. A bit of quick math says that the edges are going to be much sharper than they are in my WO 72mm f/6 with the ES 30/82, if both eyepieces have an equally flat field.




My thinking works like this:

This is a $1200 eyepiece, that's a lot of money to spend for an eyepiece for a 6 inch F/8 achromat. One can buy a Vixen 140 F/5.7 Neoachro for about $1700 that will have a bit wider field of view with a 20mm or 21mm 100 degree eyepiece and it will be flat.

The advantage of the 30mm 100 degree eyepiece is that one can use a slower telescope and still achieve the same wide field of view and magnification. But with an eyepiece like this one, coma in the Newtonian and field curvature in the refractor will still be significant issues, these can be addressed in the 2 inch format...

Jon


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Astrojensen
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Jon Isaacs]
      #5662870 - 02/05/13 03:15 AM

Quote:

But with an eyepiece like this one[30mm ES100], coma in the Newtonian and field curvature in the refractor will still be significant issues




But here is where we disagree, since my experience has shown me that once the focal length reaches 1200mm, field curvature in the refractor, when using the 30mm ES100, will most likely NOT be a problem, even without a field flattener. I can say with strong confidence that, unless something is somehow wrong with the eyepiece, that it has strong field curvature on its own, people are going to love the views through the ES30/100 in their large achros and apos.

Even if the far edges are a little out of focus (and it will be much less than the ES 30/82 or a 31mm Nagler on a 80mm f/6 or f/7), the vast majority of the field will be in extremely crisp focus and the views will be stunning.

If I had the money, I wouldn't hesitate to buy the ES30/100 for my 150mm f/8 achro, even if it's just an achro. It really excels for wide field deep-sky.

A much bigger problem will be coma in large newtonians. There are already 3" and 4" coma correctors on the market, but they are very expensive. There are also hyperbolic newtonians with 3" correctors on the market, but I've yet to hear about one that is being used visually. Most of these are also f/3.5 or so, too fast for a 30mm eyepiece. We are also moving into really big bucks territory here.

My bottom line: This eyepiece is first and foremost going to be a special item for owners of 6" and bigger refractors, with focal lengths of around 1100mm - 1200mm and longer, where it will give stunning performance. For other types of telescopes, it's not so interesting, except maybe big cassegrains, but these would benefit more from a 50mm/70 eyepiece.


Clear skies!
Thomas, Denmark


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Thomas Karpf
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Astrojensen]
      #5663139 - 02/05/13 09:26 AM

Way too expensive for me, but I wouldn't mind looking through one. I wonder if they'll be at NEAF demo'ing it?

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Levine
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Astrojensen]
      #5663340 - 02/05/13 10:51 AM

Quote:

Quote:

I still haven't figured out a scope other than the 106 FSQ that would allow this eyepiece to do it's stuff, that is to provide a reasonably well corrected field of view that is wider than existing 100 degree designs.. For wide field scopes you have two choices, Newtonians and refractors. Newtonians have coma, refractors have field curvature...




A 30mm 100 eyepiece should work pretty darn well in a 6" f/8 refractor. I can't remember how large the field stop is in the ES 30/100, but I think I recall something like 52mm, which sounds plausible. A bit of quick math says that the edges are going to be much sharper than they are in my WO 72mm f/6 with the ES 30/82, if both eyepieces have an equally flat field.

A 180mm f/7 with a 30mm/100 eyepiece is going to be incredibly fantastic, if my experience with my own ES 30mm/82 is anything to judge by. It'll be like observing visually with a Schmidt-camera telescope! My 150mm f/8 achromat fills almost the whole field in the ES30mm/82 with the tiniest, sharpest imaginable pinpoint stars.

The ES 30mm/100 eyepiece is going to be something truly special with a refractor with a focal length of 1200mm or longer (perhaps even a 1000mm focal length), used under a dark sky. Once the first experienced deep-sky observers begin to rave about how extreme the views are, then other will become interested as well. If it weren't so darn expensive, I would have preordered it by now, now that I have seen how good the ES 30mm/82 really is.


Clear skies!
Thomas, Denmark




Hmmmnnn....

Now I find myself thinking about this "pineapple" with my 210/1260 Achro...!



...what is the projected cost of the EP/Diagonal combo again...?



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Jon Isaacs
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: Astrojensen]
      #5663365 - 02/05/13 11:03 AM

Quote:

But here is where we disagree, since my experience has shown me that once the focal length reaches 1200mm, field curvature in the refractor, when using the 30mm ES100, will most likely NOT be a problem, even without a field flattener. I can say with strong confidence that, unless something is somehow wrong with the eyepiece, that it has strong field curvature on its own, people are going to love the views through the ES30/100 in their large achros and apos.




Thomas:

I don't think you can generalize so easily about field curvature and focal length. Consider this:

Field curvature is a function of the field of view and it is proportional to the square of the radius. Based on a curvature of 1/3rd the focal length of 1200mm, pretty standard for refractors, my math says that the edge of the field of a 31mm Nagler will be defocused by 0.55mm, the edge of an eyepiece with a 52mm field stop will be defocused by 0.85mm. I think both these are noticeable and significant.

The field curvature in a 1200mm focal length refractor with an eyepiece with a 52mm field stop (this eyepiece) is the same as the field curvature in a 750mm focal length refractor with a 42mm field stop, (31mm Nagler).

If one looks at refractor field curvature and field of view, a 6 inch F/5 with a 20-21mm 100 degree eyepiece has less field curvature than a 6 inch F/8 with the 30mm 100 degree but a wider field of view.

An alternative way to spend $1200 if you have a refractor with a 1200mm focal length and a 3 inch focuser:

Visual focal reducer/field flattener + 20-21mm 100 degree eyepiece. With this configuration, you can have a wider and flatter field of view. Unfortunately, in the refractor world, visual field flatteners are few and far between.. This is because they require a 3 inch focuser and need to be specifically designed to have a diagonal in the optical path. But it seems that for the widefield/richest field junky, this is the way to go.

In the Newtonian world where fast scopes and coma correctors are available and doable, Mel Bartels has a 13 inch F/3 that provides a 1.85 degree TFoV with a 21mm Ethos and a Paracorr and 6.1mm exit pupil. I have to say this is only marginally better than my 12.5 inch F/4.06 with the Paracorr and the 31mm Nagler, 1.62 degrees with a 6.6mm exit pupil. Both are coma corrected.

As someone interested in the widest fields of view that are reasonably well corrected, I am just not seeing the telescopes for this eyepiece.

As Bill would say... yet.

Jon


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zeldaboy101
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Re: Explore Scientific 3" 30mm Prototype announced! new [Re: dan_h]
      #5702215 - 02/26/13 06:21 PM

Quote:

Quote:

Quote:

Quote:

With wider (3") focusers becoming more mainstream, I'm not surprised by this. I'm actually surprised its taken this long. We should have a whole line of these out by now.




I have heard of three and four inch focusers. Does anyone make a 3" diagonal?

dan




Sure, Harry Siebert makes 'em. Has done so for years.






Well, that ups the ante a little. Level 1, 3" diagonal @ $1200, Level 2, 3" diagonal @ $2200.

Also from his web site, 3" diagonal has a 6" optical path. Might be problematic for some.

'Way outta my league.

dan




According to Woodland Hills, the 3" ES diagonal is "only" $500...

Link


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