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 6610-00-915-3215
NSN 5950-00-011-9729
NSN 6145-00-528-6467
NSN 6105-00-541-8472
NSN 5935-01-383-5949
NSN 5998-01-377-5929
NSN 6240-01-124-5309
NSN 5945-00-654-5150
NSN 6240-00-689-8504
NSN 5920-01-587-6542
NSN 6650-00-367-9230
NSN 6650-01-108-6629