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 5999-01-031-4084
NSN 5945-01-133-3627
NSN 2925-00-024-6392
NSN 5855-01-421-1440
NSN 6150-00-644-8745
NSN 5835-01-268-1924
NSN 5996-01-062-0807
NSN 5915-01-449-1188
NSN 4140-01-213-0006
NSN 7035-01-552-4231
NSN 2925-01-541-5031
NSN 5965-01-417-3211