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So i was looking for a cheap lens for a leica M. and i thought about getting a jupiter 8.
Although some say that they just used a screw mount to m adapter and tweaked the focus, others say that you should get a modified lens that has the LM mounted and proper focus work, and lastly people say that Russian lensew in general will never focus properly since they aren't ment for leica cameras
the price for a modified one is 100$
the price for a lens with adapter ~$60