MIL-F-21241, MILITARY SPECIFICATION: FILTERS, COLOR FINISHED (FOR OPTICAL INSTRUMENTS) (04 DEC 1958) [NO S/S DOCUMENT]

MIL-F-21241, MILITARY SPECIFICATION: FILTERS, COLOR FINISHED (FOR OPTICAL INSTRUMENTS) (04 DEC 1958) [NO S/S DOCUMENT]., This specification covers finished color filters for use in optical instruments. It is not intended to cover polarizing filters.