GOI “Blue Book” — Original Factory Lens Development Book (c. 1964)

GOI “Blue Book” — Original Factory Lens Development Book (c. 1964)

Rare original internal GOI (State Optical Institute, Leningrad) factory development manual, commonly known among collectors as the “Blue Book”. Compiled for in-house use by GOI engineers and technicians, this period reference documents Soviet optical design and production practice during the early–mid 1960s.