LOMO (Lenkinap) lens RO56-5 2/35mm, T/2.2, Konvas OCT-18 mount, #600479
The lens was made at Lenkinap (renamed to LOMO bit later) in 1960 (#600479). F=35mm, f/2, T/2.1.
This is 7-elements anastigmat. Resolution in the center is 50 lpmm, at the edge - 25 lpmm.
Bit faster mod of the original RO56 lens (that was T/2.5).
Mount is so called OCT-18 - for Russian 35mm film movie cameras Konvas-1M.
Mechanical condition is fine. Glass is clean and clear with just few cleaning marks.
Sample image is a crop from original picture took by Sony Nex-5. No resize, no effects applied.