An item having two plane-parallel surfaces and used in the telescopic system of an optical instrument to modify the density or spectral intensity of light by absorption. Several filters having varied characteristics are usually mounted in such a manner that any selected filter may be moved in or out of the optical axis as light conditions warrant. Excludes window, optical instrument.
Classification: Military equipments not identified by kind
NSN 5950-00-885-5887
NSN 5835-01-553-6772
NSN 6240-01-062-0878
NSN 6610-01-633-8931
NSN 6650-00-575-7487
NSN 5950-00-470-5076
NSN 6110-00-714-0115
NSN 6110-01-445-4368
NSN 5910-01-302-5941
NSN 5930-01-529-2591
NSN 5930-01-578-6392
NSN 6145-01-484-5126