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 6130-01-038-8066
NSN 6320-00-098-2858
NSN 6145-00-452-4501
NSN 5935-01-492-0266
NSN 5835-01-623-3328
NSN 4140-01-372-5718
NSN 6240-00-389-4822
NSN 5920-01-631-4009
NSN 5960-00-758-5064
NSN 5835-01-122-9657
NSN 5965-00-825-6734
NSN 6220-00-263-4893