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T-mount on one side and something strange (similar to Arri PL? on the other)?

![enter image description here

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    \$\begingroup\$ Are you sure it's actually a lens? Have you tried taking a picture with it? \$\endgroup\$
    – Peter Taylor
    Apr 13, 2018 at 10:32
  • \$\begingroup\$ I don't know if it is a lens. But has rotating ring, so could be maybe some kind of close-up part, enlarger or similar. I didn't personally try it because I cannot mount it to my equipment. \$\endgroup\$
    – Dan
    Apr 13, 2018 at 10:49
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    \$\begingroup\$ What's the diameter of the threads? If it's 44mm, then you're probably looking at a Miranda-compatible part. If it's 42mm, then what is the thread pitch (either 0.75mm (T mount), or 1mm (M42 mount)). \$\endgroup\$
    – scottbb ♦
    Apr 13, 2018 at 16:07
  • \$\begingroup\$ There's no doubt that T-mount is from one side. Bigger question is what's from the other? \$\endgroup\$
    – Dan
    Apr 15, 2018 at 7:09
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    \$\begingroup\$ looks like the objective of a binocular or telescope \$\endgroup\$
    – cmason
    Dec 4, 2018 at 18:07

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Since it doesn't have any markings I doubt its a lens for any consumer camera. I thought it might have been a DIY type 3D printed lens, but the finish is way better than what I've seen come out of most 3D printers.

My top two guesses

1) Lens for a rifle scope (with some kind of eye pad attached to the other end)

2) lens for night vision binoculars. link

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