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Equipment Discussions >> Eyepieces

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SuperSirLink
member
*****

Reged: 06/02/13

Loc: S.Valley, Va.
.965 eyepiece extension
      #5946345 - 06/29/13 11:05 AM

I have an 8x50 finder that uses .965 18mm eyepiece with 90 deg. diagonal. If I take the diagonal off, then I can't extend the helical focuser out enough to achieve focus.

So I am looking for a way to extend the focus out so I can spot without the diagonal. Most barlows I have found for .965 are 3x and way too long.

Holding the eyepiece back, it looks like I wouldn't need more than 2 or 3 inchs. Does anything exist that would help here?


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tubehead999
scholastic sledgehammer
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Reged: 11/25/08

Loc: Kennesaw, GA
Re: .965 eyepiece extension new [Re: SuperSirLink]
      #5946523 - 06/29/13 12:47 PM

You can try this....

http://www.ebay.com/itm/Tasco-2-3x-Barlow-lens-965-diameter-telescopes-/36067...

Should give you the two inches and more that removing the diagonal requires. Of course, you will have to probably punch the barlow out.


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roscoe
curmudgeon
*****

Reged: 02/04/09

Loc: NW Mass, inches from VT
Re: .965 eyepiece extension new [Re: tubehead999]
      #5947231 - 06/29/13 09:51 PM

I took apart one of those double-prism image-erecting EP adapters, and found that the two end-pieces screwed together..... an instant inch of extension!
Russ


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SuperSirLink
member
*****

Reged: 06/02/13

Loc: S.Valley, Va.
Re: .965 eyepiece extension new [Re: roscoe]
      #5947770 - 06/30/13 09:50 AM

Might give that barlow a try...

Roscoe, do you have a link so I can see?


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SuperSirLink
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Reged: 06/02/13

Loc: S.Valley, Va.
Re: .965 eyepiece extension new [Re: SuperSirLink]
      #5948502 - 06/30/13 06:55 PM

Here is the back end of the finder...




Edited by SuperSirLink (06/30/13 07:04 PM)


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tomharri
sage
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Reged: 09/19/08

Loc: USA
Re: .965 eyepiece extension new [Re: SuperSirLink]
      #5948508 - 06/30/13 07:04 PM

Try this guy:
http://www.cloudynights.com/classifieds/showcat.php?cat=500&ppuser=25634


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SuperSirLink
member
*****

Reged: 06/02/13

Loc: S.Valley, Va.
Re: .965 eyepiece extension new [Re: tomharri]
      #5948540 - 06/30/13 07:26 PM

Hmm, he had one, but he sold it already... bummer

This is the same one I have, wonder if I can find that extension... :/
http://www.cloudynights.com/classifieds/showproduct.php?product=50951&sor...

Edited by SuperSirLink (06/30/13 08:14 PM)


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roscoe
curmudgeon
*****

Reged: 02/04/09

Loc: NW Mass, inches from VT
Re: .965 eyepiece extension new [Re: SuperSirLink]
      #5948907 - 06/30/13 11:45 PM

Quote:

Roscoe, do you have a link so I can see?




I'll try hard to remember to take a photo of it tomorrow and post it for you....
R


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SuperSirLink
member
*****

Reged: 06/02/13

Loc: S.Valley, Va.
Re: .965 eyepiece extension new [Re: roscoe]
      #5950136 - 07/01/13 06:30 PM

Thanks much!!

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roscoe
curmudgeon
*****

Reged: 02/04/09

Loc: NW Mass, inches from VT
Re: .965 eyepiece extension new [Re: SuperSirLink]
      #5950909 - 07/02/13 08:50 AM Attachment (4 downloads)

Here's a photo of my extension:

As I said, I took both the focuser-end tailpiece and the EP-holder out of one of those cylindrical image-erector adapters that came with lots of older 60mm scopes, and in my case, they screwed together. I looked at another one I have, and both ends screwed into the round prism-housing, so that one wouldn't work......
I also have a short 2x barlow that came with a newer 60mm that's around 3" total length, which would work as an extension if the lens was removed, but it's plastic, so might not be real durable.....
Unfortunately, I messed up the best photo of my adapter shrinking it to post here (my computer's a linux os, and the photo program is a bit more complicated than my mac was...) so here's the second-best view.....


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SuperSirLink
member
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Reged: 06/02/13

Loc: S.Valley, Va.
Re: .965 eyepiece extension new [Re: roscoe]
      #5951982 - 07/02/13 07:51 PM

Ahh ok, thanks for sharing that... I found someone here in the classifieds with an extension for sale. But if that doesn't work, I guess I will just get the vixen adapter and convert it to 1.25"...

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