I found a cheap Industar 28mm lens, so I thougt it would fit to my favourite soviet rangefinder, the Fed-2. The result was, er, um, unexpected : super invasive vignetting, and above all absent sharpness.
I found out that this lens is M39 "compatible", except that it was intended for a Chajka, a Belomo half-frame camera. So there is no rangefinder coupling, it doesn't cover the full frame, and the focus scale is inaccurate on my camera. Now, the photos have that ultra lo-fi style, it's kind of funny but I doubt I will use that lens again.

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