Non-focusing lens?

Yan Lauzon

Senior Member
Greetings,

I have acquired an "unknown" lens on eBay as a way to try more interesting techniques on my camera. It is a former USSR lens with no markings.

Not having any data on the lens, I wasn't quite sure what to expect. All I knew was it's m42 mount, and I also got an m42-F-mount adapter.

The lens has an iris (and a pretty fast aperture, not sure how to measure it)

What the lens does not have is anything to focus.
Come to think of it, that may have been an old projection lens. Or perhaps the rear half of a lens with the front missing.

I am curious as to my options to get this lens in focus. Can we add a second, focusing element?

In the meanwhile I ordered a F-mount compatible focusing bellows off ebay to give me something to try.

I wonder what good will come out if this lens... Any ideas greatly welcomed.
 

Yan Lauzon

Senior Member
Here are picture of this unknown soviet lens.

The iris works great. The lens finishes quite inside the barrel. The outside has threading as if to hold another portion.

If I hold the lens a few cm apart from my camera I can achieve focus.

I am not sure what size lens this is (how can we measure that?)
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