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 5915-00-356-5558
NSN 5990-01-191-9624
NSN 6150-01-367-5730
NSN 5895-00-269-3848
NSN 6130-01-423-0612
NSN 5990-01-419-0661
NSN 6650-01-325-3747
NSN 5945-01-502-5961
NSN 6610-01-477-6476
NSN 5835-01-592-2350
NSN 6650-00-139-5459
NSN 2925-01-433-8915