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 5945-01-469-3035
NSN 6110-01-463-5624
NSN 5910-00-945-0313
NSN 5960-01-278-2852
NSN 6320-01-462-3555
NSN 7035-01-593-8058
NSN 5975-00-221-7175
NSN 5965-00-529-0602
NSN 6145-01-313-8678
NSN 5998-00-915-8570
NSN 5855-00-149-0766
NSN 6150-00-727-5160