The Russar MR-2 was manufactured by KMZ for the Zorki / FED. It has a maximum aperture of f/5.6 and a focal length of 20 mm. It will focus down to 50 cms. This particular one has a black finish. In the photos, you will see alongside the lens, the specially produced viewfinder. The base of which is made to slide, so tilting the viewfinder in order to correct for parallax.

David Tomlinson.