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MIL-STD-1278, MILITARY STANDARD: FILTERS, LIGHTS, PHOTOGRAPHIC (20 OCT 1966) [NO S/S DOCUMENT]., This standard is issued to describe a general method of describing filters according to construction type, optical quality, and intended use, and to establish uniform definitions, general requirements (which includes the military filter designation system), detailed requirements, and test methods for filters used in military photographic work.