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 6645-01-190-4297
NSN 5960-01-487-4791
NSN 5990-00-144-3243
NSN 5910-00-677-2806
NSN 6220-01-634-0660
NSN 5996-00-050-6570
NSN 6220-00-893-9776
NSN 6105-01-038-6824
NSN 5998-01-371-4304
NSN 6685-00-623-7839
NSN 5950-01-263-6963
NSN 7035-01-610-6073