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artmustel
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Reged: 05/30/07
Posts: 128
Binocular eyepiece for telescope? new
      #3096199 - 05/10/09 01:11 PM

It is feasible to make a telescope eyepiece out of a binocular eyepiece? By instance, I have a broken 7x35 binocular which eyepieces are pretty good. I was thinking about gluing one of them to an empty 35mm film canister, to fit in the telescope focuser. Is it supposed to "work"? If so, how would be the approximated equivalent of such eyepiece? Thanks!

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droid
rocketman


Reged: 08/29/04
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Re: Binocular eyepiece for telescope? new [Re: artmustel]
      #3096246 - 05/10/09 01:41 PM

They make outstanding eye peices,typically.Some of the really junk binos are questionable, but almost everything Ive torn apart for eps has been good for something.
A lot of the small bino eps will be a close fit for a .965 might need a wrap of tape or something, with a 35mm film canister you can make a 1.25 ep.

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artmustel
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Reged: 05/30/07
Posts: 128
Re: Binocular eyepiece for telescope? new [Re: droid]
      #3096260 - 05/10/09 01:51 PM

Thanks for your response!
What would be the approx. focal lenght of one of these binoculars eyepieces? All I know this is a 7x35 binocular. Thanks!

Edited by artmustel (05/10/09 01:52 PM)


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arpruss
Carpal Tunnel


Reged: 05/23/08
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Re: Binocular eyepiece for telescope? new [Re: artmustel]
      #3096285 - 05/10/09 02:04 PM

Quote:

Thanks for your response!
What would be the approx. focal lenght of one of these binoculars eyepieces? All I know this is a 7x35 binocular. Thanks!




You can measure it. See this article on AM:
http://www.astromart.com/articles/article.asp?article_id=700

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grendel
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Reged: 04/12/09
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Re: Binocular eyepiece for telescope? new [Re: arpruss]
      #3096395 - 05/10/09 03:10 PM

I have found they tend to need to be racked out a little further compared to standard eyepieces, but yes they do make spectacular eyepieces, remember they are designed for short focal lengths, so the optics need to be pretty good.
Grendel

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plus many more I cant remember the details for at the moment


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ccs_hello
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Re: Binocular eyepiece for telescope? new [Re: grendel]
      #3097039 - 05/10/09 09:34 PM

One of my 7x35 bino's has the objectives with f.l. equals to approx. 130mm. (Both of them are used as focal reducers .) So EP's fl = 18.6mm

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GlennLeDrew
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Re: Binocular eyepiece for telescope? new [Re: ccs_hello]
      #3105391 - 05/14/09 07:44 PM

I've also noted that most bino eyepieces tend to be in the 19-20mm f.l. range. 20X60 eyepieces are about 13mm, and 7X50 eyepieces are near 27mm.

That bino eyepieces are designed to work reasonably well with rather 'fast' objectives (most often less than f/4), they should perform even better with your typically 'slower' 'scope f/ratio.

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calypsob
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Reged: 04/20/13
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Re: Binocular eyepiece for telescope? new [Re: GlennLeDrew]
      #5979030 - 07/19/13 12:42 AM

This thread is old I know but I want to know if it is possible to use the a bino or monocular as an eyepiece without taking it apart? I have an old zeiss monocular and wow it would be great to use it as an eyepiece. It is an 8x30b monocular.

Edited by calypsob (07/19/13 12:52 AM)


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GlennLeDrew
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Re: Binocular eyepiece for telescope? new [Re: calypsob]
      #5979381 - 07/19/13 08:59 AM

A complete monocular works by itself to focus on objects rather distant. It can't work as an eyepiece with its own objective in place.

--------------------
Home-made and modified binoculars
Mallincam VSS+

My Gallery (mostly DIY stuff) **UPDATED Feb 7 2013**

Simple minds discuss people. Good minds discuss events. Great minds discuss ideas. - Hyman Rickover



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BigC
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Reged: 09/29/10
Posts: 1894
Loc: SE Indiana
Re: Binocular eyepiece for telescope? new [Re: calypsob]
      #5979468 - 07/19/13 09:44 AM

How difficult is it to remove the objective?

Many binocular objective lens cell simply screw on or in the barrell with fine threads.

Although there is a risk of messing up something with every disassembly and re-assembly.

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calypsob
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Reged: 04/20/13
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Re: Binocular eyepiece for telescope? new [Re: GlennLeDrew]
      #5979470 - 07/19/13 09:45 AM

Hmm iguess i assumed that would be the case. So with a pair of porro prism binos could I create an eyepiece? These zeiss binos are quite modular and it is quite easy to dissassemleand reassemble them if need be

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calypsob
member


Reged: 04/20/13
Posts: 36
Re: Binocular eyepiece for telescope? new [Re: BigC]
      #5979503 - 07/19/13 10:04 AM

Ok actually i think the entire focusing eyepiece mechanism can come off, there is a picture of the setup on this link http://www.binoculars-cinecollectors.com/html/body_german.html. It would be great to get a zeiss eyepiece out of this!

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StarStuff1
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Re: Binocular eyepiece for telescope? new [Re: calypsob]
      #5979961 - 07/19/13 02:50 PM

A few years ago I had good success with old eps from 6x30 military binoculars. They had to be turned down in a small lathe only a few thousandths of an inch to work in .965-in focusers but they did work well! Around 22-24mm fl.

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GlennLeDrew
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Re: Binocular eyepiece for telescope? [Re: StarStuff1]
      #5979998 - 07/19/13 03:15 PM

A Zeiss bino eyepiece is not necessarily the same thing as a Zeiss (or most any) telescope eyepiece. If the eyepiece is optimized for a fast bino objective of short focal length, it *may* not work as well as hoped in a telescope. The only thing for it is to try one out, if you're suitably motivated...

--------------------
Home-made and modified binoculars
Mallincam VSS+

My Gallery (mostly DIY stuff) **UPDATED Feb 7 2013**

Simple minds discuss people. Good minds discuss events. Great minds discuss ideas. - Hyman Rickover



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