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 5855-01-050-4944
NSN 6110-01-418-0802
NSN 7035-01-247-6256
NSN 5996-01-538-2315
NSN 6145-00-331-6814
NSN 5895-01-192-5507
NSN 5915-01-555-8852
NSN 6620-01-327-3011
NSN 5945-01-079-5249
NSN 6135-01-230-4399
NSN 6145-00-228-7606
NSN 6130-01-435-5105