Also has been: Iskra-3: 0.65/72 11,5 deg., 1957 year design "ZL" ("zerkal'no-linzovyj" -- catadioptric lens): 0.85/55 13 deg. 40 ', 1950 year "ZL": 0.85/55 14 deg., 1952 year OF-18a: 0.9/100 18 deg., 1936 year Rekord-4: 0.9/45 45 deg., 1967, serial production in 1971 year Rekord-5: 0.9/36 45 deg., 1967 year Takhon: 0.95/52 17 deg., 1937 year