Mounted Circular Neutral Density (ND) Filters

Mounted Circular Neutral Density (ND) Filters provide continuously variable, linear attenuation of incident light by rotating the filter about its center. The transmitted intensity is varied as a function of the optical density range. An inexpensive, ergonomic hub assembly holds the glass filter securely to the mount block. The Delrin® hub ensures a protective surface against the filter. Mounted Circular Neutral Density (ND) Filters feature a convenient ¼-20 tapped hole in the aluminum mount block that permits a variety of mounting configurations. The filter is rotated manually by turning along the outside edge, front knob, or rear turning screw. A 4" long, 0.5" diameter stainless steel post is included.