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Eyepieces
Discuss telescope eyepieces.
Topics: 270

270 Topics

3259 Posts

Last post Re: Eyepiece for EdgeHD11
by OzEclipse View the latest post
Thu May 25, 2023 11:41 pm
Binoculars
Discuss binoculars.
Topics: 131

131 Topics

1396 Posts

Last post Re: Binoculars used for anyth…
by messier 111 View the latest post
Thu Jun 01, 2023 1:08 am
General Optics
Discussion of optical systems and their characteristics.
Topics: 31

31 Topics

323 Posts

Last post Re: Correcting coma in my 102…
by SkySurfer View the latest post
Sat May 13, 2023 1:08 pm

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Last post

Creating a basic set of eyepieces for your new telescope

Last post by Bigzmey « Thu Oct 20, 2022 8:57 pm
Replies: 67
by Lady Fraktor » Thu May 23, 2019 2:34 am
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First post

One of the most asked questions by beginners, What eyepieces should I get?

There is always a lot of discussion from people on what eyepieces to get...

Last post

I use combination of increase by factor (i.e. by 1.4x), exit pupil and U curve.

I star with 2mm exit pupil, where most of my galaxy hunting is done...
67 Replies

96652 Views

Last post by Bigzmey
Thu Oct 20, 2022 8:57 pm
The 1X / 2X / 3X Magnification Protocol for eyepiece set selection

Last post by 25585 « Sun Feb 27, 2022 12:25 pm
Replies: 26
by Don Pensack » Tue May 25, 2021 10:29 pm
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First post

I wrote this a bit over 15 years ago. It still works today to yield a very basic set on which to build:

1X / 2X / 3X Magnification Protocol for...

Last post

With the exception of my ES92s & Baader Morpheus ranges, I normally stay below 65° for FL <20mm. To have a FoV where its all visible, as for...
26 Replies

20081 Views

Last post by 25585
Sun Feb 27, 2022 12:25 pm
Evolution of Eyepieces by Chris Lord

Last post by j.gardavsky « Sun Aug 15, 2021 3:39 pm
Replies: 19
by notFritzArgelander » Sun Oct 27, 2019 2:36 am

First post

I just brought this over from the old place. I suggest we make this sticky?

Last post

You might like this information, too:

The Erfles, and some other eyepieces are desribed by the Zeiss designers in

DIE FERNROHRE UND...

19 Replies

38447 Views

Last post by j.gardavsky
Sun Aug 15, 2021 3:39 pm
Optics Websites

Last post by Don Pensack « Sun Jul 11, 2021 2:35 pm
Replies: 18
by mikemarotta » Fri Jul 02, 2021 6:00 pm

First post

I found this one:

Amateur Telescope Optics by Vladimir Sasek.

it seems all right and several or many others must be out there.
Any other leads?...

Last post

Enjoy Mr. Suiter book when you get to read it. :)

Star Testing Astronomical Telescopes: A Manual for Evaluation and Adjustment by Harold Richard...

18 Replies

18618 Views

Last post by Don Pensack
Sun Jul 11, 2021 2:35 pm
A Guide to choosing eyepieces

Last post by OleCuss « Fri Jul 02, 2021 4:58 pm
Replies: 13
by OleCuss » Sat Apr 27, 2019 4:40 am

First post

There is much controversy over eyepieces and their selection and this will persist for eternity. The reason for this is that each of us has a...

Last post

As long as it works for you, I'm happy!

13 Replies

31853 Views

Last post by OleCuss
Fri Jul 02, 2021 4:58 pm
Binoculars used for anything

Last post by messier 111 « Thu Jun 01, 2023 1:08 am
Replies: 10
by Nakedgun » Wed Apr 19, 2023 7:57 pm

First post

~

We have a category for most used astro binos, so what about any others you have and use for general observing, or even astronomy, though they may...

Last post

here's what I've been using since the 90s.
they were made in japan.

10 Replies

205 Views

Last post by messier 111
Thu Jun 01, 2023 1:08 am
Eyepiece for EdgeHD11

Last post by OzEclipse « Thu May 25, 2023 11:41 pm
Replies: 7
by ic_1101 » Wed Apr 05, 2023 3:20 pm

First post

Hi all! Being mainly an AP imager I have only a few eyepieces for visual use (20&30mm). Lately my grandkids have shown an interest in viewing the...

Last post

Lot's of good recommendations already posted.

My 18 f5.5 has a 2500mm focal length, not that different to the Edge 11.

For planet observing all...

7 Replies

229 Views

Last post by OzEclipse
Thu May 25, 2023 11:41 pm
At It Again

Last post by Don Pensack « Tue May 23, 2023 4:06 pm
Replies: 6
by LDW47 » Fri Apr 14, 2023 2:06 pm

First post

Even though I have almost a complete set of Morpheus eyepieces which was preceded by the Hyperions which were preceded by a set of ........, which...

Last post

I briefly had APM 18mm version and it was a very comfortable EP. I wish smaler FLs had better eye relief though.

I think the 10mm has a 16mm er,...

6 Replies

250 Views

Last post by Don Pensack
Tue May 23, 2023 4:06 pm
Nice sale on Explore Scientific EPs

Last post by Bigzmey « Sat May 20, 2023 1:36 am
Replies: 9
by Ylem » Thu Apr 06, 2023 10:37 pm

First post

I received an email from Agena with some good sales, especially on ES EPs, especially the 68°s

Last post

Congrats! This is a nice set of glass. I see a room for a couple more. :D

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Haven't yet figured out just what will occupy those spaces.

....

9 Replies

265 Views

Last post by Bigzmey
Sat May 20, 2023 1:36 am
Correcting coma in my 102 f/5 Startravel

Last post by SkySurfer « Sat May 13, 2023 1:08 pm
Replies: 16
by John Baars » Tue Mar 07, 2023 1:04 pm

First post

In my review I wrote about some flaws in my new 102mm f/5 Startravel.

Near focus the Poisson point was found to be not exactly in the center, but...

Last post

Yikes! I'm not brave enough to try such surgery on my ST 102, but I did swap out the focuser for 2 speed Crayford. Not top of the line, but neither...

16 Replies

554 Views

Last post by SkySurfer
Sat May 13, 2023 1:08 pm
Canon 10X30 IS II

Last post by Jerome Howard « Sun Apr 30, 2023 2:08 am
Replies: 7
by John Baars » Mon Oct 04, 2021 11:41 am

First post

P1010676 - kopie (1280x961).jpg

At the Dutch Forum, which I sometimes visit:-), I saw a fellow observer about my age with an enthusiastic report...

Last post

I love mine. As was stated earlier, the steadiness is great. A game changer.

7 Replies

5813 Views

Last post by Jerome Howard
Sun Apr 30, 2023 2:08 am
Which binoculars do you use most for astronomy?

Last post by OzEclipse « Sun Apr 02, 2023 4:48 am
Replies: 106
by John Baars » Tue Jun 16, 2020 9:26 pm
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First post

A common wisdom is the saying that the best telescope is the one you use most.
I think that goes for binoculars as well.
Over the years I collected...

Last post

Orion 9x63's. As others have mentioned, these are probably at or near the hand holding limit. The exit pupil is a bit big for me, they are great for...
106 Replies

45403 Views

Last post by OzEclipse
Sun Apr 02, 2023 4:48 am
Astrotech PF EPs?

Last post by Bigzmey « Fri Mar 17, 2023 6:31 pm
Replies: 1
by pakarinen » Fri Mar 17, 2023 2:09 pm

First post

Anybody have eyes-on experience with Astrotech PF EPs? I thought I might try one as a spare just for grins since they're only $60 or so.

Last post

Just looking at the form factor and specs I don't believe they are well corrected for fast scopes like yours. Expect to see some field distortions.

1 Replies

152 Views

Last post by Bigzmey
Fri Mar 17, 2023 6:31 pm
Classic find

Last post by Unitron48 « Fri Mar 17, 2023 4:46 pm
Replies: 9
by Bigzmey » Sun Feb 26, 2023 6:26 pm

First post

I have been looking for this classic EP for awhile. Finally, last week a gentleman from San Diego responded to my wanted ad. Behold Meade second...

Last post

Very nice! Can't wait to hear your report!!

Dave

9 Replies

323 Views

Last post by Unitron48
Fri Mar 17, 2023 4:46 pm
The Barlow Lens ?

Last post by Frankskywatcher « Thu Mar 09, 2023 1:50 pm
Replies: 36
by Frankskywatcher » Tue Feb 28, 2023 5:52 pm
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First post

I’m posting this in the hopes of getting some insight about Barlow lenses.

I’m just really curious how often they are used,the results, price ranges...

Last post

Hello Frank. It was my pleasure to send you that fine Barlow lens and I hope that you will have many great views and observing sessions using it with...
36 Replies

943 Views

Last post by Frankskywatcher
Thu Mar 09, 2023 1:50 pm
Optical Reports

Last post by John Baars « Tue Mar 07, 2023 11:12 pm
Replies: 4
by Lady Fraktor » Thu Feb 16, 2023 9:07 pm

First post

I was looking around a different astro site when I read a conversation about someone not being able to get a Zygo report for his refractor so was no...

Last post

I agree with Lady Fraktor. One should learn to do his/her own testing if necessary. Most of the time it isn't, one can recognize quality when one...

4 Replies

248 Views

Last post by John Baars
Tue Mar 07, 2023 11:12 pm
Zoom EP questions

Last post by messier 111 « Wed Mar 01, 2023 1:07 am
Replies: 6
by Ylem » Tue Feb 28, 2023 10:47 pm

First post

I have been thinking about snagging one for both solar and vacation use.
What I don't really like about them is it seems FOV Increases with higher...

Last post

hi jeff ,
here is the one I use with my televue 85 .

I like the eye relief and the field of view.
for the price it is very good.
I use it to see the...

6 Replies

195 Views

Last post by messier 111
Wed Mar 01, 2023 1:07 am
Celestron 24mm Ultima Edge

Last post by LDW47 « Sat Feb 25, 2023 10:08 pm
Replies: 27
by LDW47 » Sat Feb 18, 2023 1:55 pm
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I am looking at replacing my Baader 21mm Hyperion with the Celestron 24mm Ultima Edge. Good plan or poor plan ? Is it worth it or not worth it ? My 5...

Last post

As usual and as with other astro sites this has mushroomed in to a lot more than my simple question about my acquiring that ep. The post / issue was...
27 Replies

696 Views

Last post by LDW47
Sat Feb 25, 2023 10:08 pm
My Newest

Last post by Don Pensack « Sat Feb 25, 2023 3:43 pm
Replies: 13
by LDW47 » Tue Jun 15, 2021 1:55 pm

First post

A new competitor to my other widefields. 2 , 31.5mm, 90° FOV . Tonite skies are to be average / above average, it will get a good testing against my...

Last post

I might mention that Ramsden and Huygens eyepieces were designed in the era when f/15 would have been considered a fast f/ratio.
When Kellners,...

13 Replies

1253 Views

Last post by Don Pensack
Sat Feb 25, 2023 3:43 pm
Vixen 4mm SLV on the way

Last post by Bigzmey « Fri Feb 24, 2023 6:10 pm
Replies: 3
by pakarinen » Fri Feb 24, 2023 12:23 pm

First post

Showed as OOS at US vendors so I ordered through Vixen Japan / AMZ. I guess this means it's made it to the US. :lol:

4mm.jpg

Last post

Congrats! Those are among my favorites. SLV 4mm getting used a lot in my 102ED and 80ED scopes.

3 Replies

163 Views

Last post by Bigzmey
Fri Feb 24, 2023 6:10 pm
1.25" to 2" Adapter

Last post by CygnusX-1 « Fri Feb 24, 2023 1:50 pm
Replies: 5
by LDW47 » Wed Nov 23, 2022 8:48 pm

First post

Does / has anyone used a 1.25 to 2 adapter in their telescope in order to utilize their 2 eps in their 1.25 scope ?

Last post

Had to screen cap my post as it wouldn't go in and was marked as spam???

5 Replies

350 Views

Last post by CygnusX-1
Fri Feb 24, 2023 1:50 pm
Svbony 7-21

Last post by LDW47 « Mon Feb 20, 2023 4:42 pm
Replies: 8
by Frazman » Wed Feb 01, 2023 12:33 pm

First post

A bit of our viewing here is accomplished by trekking in on foot to remote spots. With that in mind, we try to keep things light (hence the recent...

Last post

A bit of our viewing here is accomplished by trekking in on foot to remote spots. With that in mind, we try to keep things light (hence the recent...

8 Replies

296 Views

Last post by LDW47
Mon Feb 20, 2023 4:42 pm
Explore Scientific EPs sale

Last post by helicon « Wed Feb 15, 2023 2:25 pm
Replies: 1
by Bigzmey » Mon Feb 13, 2023 9:10 pm

First post

Some good savings on many ES EPs.

Last post

Good to hear.

1 Replies

166 Views

Last post by helicon
Wed Feb 15, 2023 2:25 pm
2023 Eyepiece Buyer's Guide

Last post by Bigzmey « Sat Feb 11, 2023 9:47 pm
Replies: 9
by Don Pensack » Sun Feb 05, 2023 3:45 pm

First post

I just completed the 2023 Eyepieces Buyer's Guide

It is posted here:

It is free to download.

Almost 1700 entries this year, the largest number...

Last post

Thanks for putting (a lot of) effort in Don, this is a great reference.

9 Replies

308 Views

Last post by Bigzmey
Sat Feb 11, 2023 9:47 pm
Thanking Don For My Birthday Presents

Last post by helicon « Sat Feb 11, 2023 7:12 pm
Replies: 5
by JayTee » Sat Feb 11, 2023 1:12 am

First post

Each one of my 4 sons used proffered monies to get wonderful birthday presents for me!

I would also like to thank Don's Don Pensack store for...

Last post

Excellent JT!

5 Replies

226 Views

Last post by helicon
Sat Feb 11, 2023 7:12 pm

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