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 6105-01-650-6060
NSN 5935-00-411-2930
NSN 5975-00-079-0022
NSN 6145-01-629-9381
NSN 6110-00-066-9614
NSN 6240-01-020-9910
NSN 5975-01-337-5658
NSN 6150-00-263-3451
NSN 5905-00-961-8477
NSN 5835-00-366-0240
NSN 6240-01-563-5684
NSN 4140-00-931-9638