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 5985-00-205-2922
NSN 5920-01-107-0838
NSN 5998-01-219-0967
NSN 5935-00-515-6967
NSN 7035-01-244-9179
NSN 6320-01-116-3980
NSN 5920-01-212-9504
NSN 6130-00-917-7502
NSN 6105-01-204-2920
NSN 5996-01-146-1390
NSN 6320-01-501-7935
NSN 6105-00-635-9809