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 5998-01-558-5971
NSN 5920-01-485-3280
NSN 6130-01-393-1238
NSN 5895-00-295-3735
NSN 6110-01-588-8383
NSN 7035-01-184-8905
NSN 6105-01-634-0322
NSN 5925-01-043-7346
NSN 5945-01-323-6496
NSN 5996-01-215-6103
NSN 5998-01-422-1117
NSN 6145-01-539-3046