Description

These filters have a precisely-graduated Ni-Cr-Fe coating and can be used as variable attenuators or as variable neutral beamsplitters. A combination of two filters with opposite orientation gives uniform density over larger apertures.

The circular filters have density varying with angle, allowing adjustments by simple rotation.  Both surfaces have multilayer AR coatings.  We offer both unmounted discs and complete assemblies with scale graduated in degrees and M6 thread to take standard posts.

An economical alternative is the rectangular linear filter with density increasing along the length. This has a multilayer-AR coated rear face and a small wedge (15') across the width to reduce multiple reflections.