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So I've researched this as much as I can online, but so much of the discussion I've found is from 2005 era.

I have a couple of old, nice telephoto lens that I hardly use, and it occurred to me that they'd probably make nice telescopes, and it seems like it must be possible, but it's quite hard to find info on it.

I did find that there's a company that does a lot of macro extension tubes (Kenko I believe?) who do make some converters, but they go for about $180 at B&H, and I'm not interested in paying that much. I thought I could buy a telescope eyepiece for maybe $30 or $50 and somehow attach it to a telephoto lens and make it work somehow?

It seems like an ideal task for a 3D printer, but I don't know how that'd work, especially what exact length I'd need to space between the telescope eyepiece and the lens (if that is indeed how I'd do it).

Anyone?

user3833000
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    I'm voting to close this question as off-topic because it is about using photographic lenses to do something other than take photographs. – Michael C Sep 16 '15 at 04:20
  • perhaps http://astronomy.stackexchange.com/ would be a more appropriate place for this question? – Michael C Sep 16 '15 at 04:21
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    @MichaelClark I do not agree. What if the user wanted to photograph stars? – Noldor130884 Sep 16 '15 at 06:31
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    Then you would connect the lens to the camera, not ask how to make a DIY adapter so you can use the lens without a camera. We already have quite a number of the first type of question. – Michael C Sep 16 '15 at 07:47

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Why not hold a lens in one hand and the objective in the other, look through that and see what distance works? I did that with a loupe and a macro filter, and was able to see the image and easily get tye distance.

JDługosz
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