Telescope Reviews: ES 25mm 100 AFOV Shipped

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Equipment Discussions >> Eyepieces

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JMW
scholastic sledgehammer

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)

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

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

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
scholastic sledgehammer

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
member

Reged: 01/11/12

Loc: PA

Re: ES 25mm 100 AFOV Shipped (Pictures) new

[Re: johnnyha]
#5612708 - 01/08/13 09:01 PM Attachment (78 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
scholastic sledgehammer

Reged: 02/11/07

Loc: Nevada

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
Carpal Tunnel

Reged: 02/24/07

Loc: California, USA

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
Carpal Tunnel

Reged: 05/11/06

Loc: Covington, GA

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
Vendor (EyepiecesEtc.com)

Reged: 06/24/03

Loc: Los Angeles

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
member

Reged: 01/11/12

Loc: PA

Re: ES 25mm 100 AFOV Shipped (Pictures) [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
scholastic sledgehammer

Reged: 12/22/06

Loc: Plymouth, Minnesota, USA

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
Vendor (AGENA AstroProducts)

Reged: 02/22/05

Loc: Los Angeles Area, CA

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
sage

Reged: 05/29/12

Loc: SF Bay Area, California

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
Vendor (EyepiecesEtc.com)

Reged: 06/24/03

Loc: Los Angeles

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 NC
Mad Hatter

Reged: 03/05/05

Loc: NC

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
Vendor (EyepiecesEtc.com)

Reged: 06/24/03

Loc: Los Angeles

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
sage

Reged: 03/21/07

Re: ES 25mm 100 AFOV Shipped (Pictures) [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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