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Eyepieces
Discuss telescope eyepieces.
Topics: 267

267 Topics

3234 Posts

Last post Re: Astrotech PF EPs?
by Bigzmey View the latest post
Fri Mar 17, 2023 6:31 pm
Binoculars
Discuss binoculars.
Topics: 130

130 Topics

1383 Posts

Last post Re: Which binoculars do you u…
by Frankskywatcher View the latest post
Sun Mar 19, 2023 3:21 am
General Optics
Discussion of optical systems and their characteristics.
Topics: 31

31 Topics

322 Posts

Last post Re: Correcting coma in my 102…
by Lady Fraktor View the latest post
Tue Mar 21, 2023 8:27 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

95751 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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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...

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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

19737 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

38156 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

17829 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

31640 Views

Last post by OleCuss
Fri Jul 02, 2021 4:58 pm
Correcting coma in my 102 f/5 Startravel

Last post by Lady Fraktor « Tue Mar 21, 2023 8:27 pm
Replies: 15
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

I was trying to fix a situation of over corrected with spherical chromatism and lateral colour.
Checked wedge, spacing, lens centering, orientation...

15 Replies

196 Views

Last post by Lady Fraktor
Tue Mar 21, 2023 8:27 pm
Which binoculars do you use most for astronomy?

Last post by Frankskywatcher « Sun Mar 19, 2023 3:21 am
Replies: 105
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

Using an old pair of 7X50 to find star cluster then observe them thru my DOB .
I would like to someday obtain a pair of 10X50 but the price of fully...
105 Replies

44097 Views

Last post by Frankskywatcher
Sun Mar 19, 2023 3:21 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

43 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

152 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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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

493 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

122 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

61 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

371 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...

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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

1051 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

49 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

213 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

138 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

65 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

130 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

100 Views

Last post by helicon
Sat Feb 11, 2023 7:12 pm
Stellarvue EUW 82 Deg. On Sale

Last post by The Wave Catcher « Sat Feb 11, 2023 1:10 am
Replies: 1
by Don Pensack » Sat Feb 11, 2023 12:06 am

First post

Huh?
They're $149 each on the Stellarvue website and $129 each on my website.
Where are they $50?
You save $50 over the $179.00 list price.
Maybe...

Last post

Hi Don,

Thanks for correcting me, I must of had a brain fart. You are correct, I misread it. Maybe the administrators can delete this thread for...

1 Replies

73 Views

Last post by The Wave Catcher
Sat Feb 11, 2023 1:10 am
Edmund RKE a classic or outdated?

Last post by Don Pensack « Wed Feb 01, 2023 4:18 pm
Replies: 21
by helicon » Tue Oct 11, 2022 3:04 pm
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I still have my circa 1979 Edmund Scientific RKE, a modified Kellner design which Edmund patented back in the 1970's. It came with my red tube 4.25...

Last post

The Nagler 3-6 zoom has an eye lens that is only about 1/3 as large as the top of the eyepiece.
But by the time you get to the exit pupil of the...
21 Replies

695 Views

Last post by Don Pensack
Wed Feb 01, 2023 4:18 pm
Is this ruined?

Last post by Frazman « Sun Jan 15, 2023 11:48 pm
Replies: 10
by Frazman » Thu Dec 29, 2022 12:23 am

First post

304DE053-3BFB-49F6-BF60-E91408E318C6.jpeg

Years ago I found this 102/600 lens for sale and bought it for a project scope, cutting down a 102/1000...

Last post

Weather has been sporadic and on the somewhat clear nights Luna has been in the way.

The one night I was able to get out just a short while I saw...

10 Replies

366 Views

Last post by Frazman
Sun Jan 15, 2023 11:48 pm
AstroTech UWA 82*

Last post by pakarinen « Tue Jan 10, 2023 2:01 pm
Replies: 3
by Frazman » Thu Dec 29, 2022 11:49 pm

First post

EA393D1C-5F3F-41A6-811F-B1402DBE9932.jpeg

A new scope deserves new glasses, yes, I’m sure I heard that SOMEWHERE?!

If I am wrong just let me be...

Last post

Huh. I just happen to have a new AT72ED and a couple of AT Paradigms. ;) Might be time to try a wider FOV AT.

I know what you mean about the vertigo...

3 Replies

209 Views

Last post by pakarinen
Tue Jan 10, 2023 2:01 pm
Svbony 3-8mm Zoom

Last post by pakarinen « Tue Jan 10, 2023 1:56 pm
Replies: 4
by WilliamPaolini » Sat Jan 07, 2023 8:41 pm

First post

IMG_2207 (web).jpg

Received a Svbony 3-8 Zoom yesterday and took it out for a daytime spin today as well as did some bench test measures. Been...

Last post

Skies were clear, cold (38 deg F / 3.3 C), and a little breezy tonight so gave the Svbony 3-8mm Zoom a try on Jupiter, Mars, Betelgeuse, and M42/43...

4 Replies

373 Views

Last post by pakarinen
Tue Jan 10, 2023 1:56 pm

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