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The Industar-50-2 f3.5 is a screw-mount lens manufactured in the soviet union for decades until the 1990's, mostly for the Zenit SLR cameras.
Its predecessor was the Carl Zeiss Tessar design available in M39 (39mm) screw-mount standard lens for the Zorki camera series.
Older variants (ancient Leica lens style) were made by LZOS.

Using an adapter I have tested this on my Nikon fit Fuji and the results were very good, however need to find a Hot Mirror Filter to fit it if I wish to do anything other than Near Infrared, could be a tricky diameter filter to find?
Vintage Camera Kit