1-CNF-3-A100 BK7 Circular Variable Neutral Density Filter, Ø100 mm, OD = 0.04 to 3.0 nm, T = 90 to 0.1 %

Transmitted intensity varies as a function of the optical density range. The filter can be used for white light as well as for lasers. A large finite aperture can be attenuated by counter rotating two filters in series. Sizes are available from 25 mm to over 100 mm in diameter.