Circular Variable Neutral Density filter is an economical solution to attenuate the light

Circular ND filters provide continuously variable, linear attenuation of light by rotating the filter around its center. 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.

Standard Specifications Material BK7; UVFS Inside Diameter 8.0 mm Operating Wavelength Range 380-2000 nm (BK7) 250-2500 nm (UVFS) Surface flatness <λ @ 632.8 nm Surface quality 60-40 S-D Clear aperture >90% Parallelism ±arcmin Type reflective

8MRU-1 Universal Motorized Rotation Stage

4CFH-8 Circular Variable Neutral Density Filters Holder

Circular Variable Neutral Density Filters Ø25 mm14CNDF-25-90/10-114CNDF-25-90/1-114CNDF-25-90/01-114CNDF-25-90/10-214CNDF-25-90/1-214CNDF-25-90/01-2

Circular Variable Neutral Density Filters Ø50 mm14CNDF-50-90/10-114CNDF-50-90/1-114CNDF-50-90/01-114CNDF-50-90/10-214CNDF-50-90/1-214CNDF-50-90/01-2

Circular Variable Neutral Density Filters Ø100 mm14CNDF-100-90/10-114CNDF-100-90/1-114CNDF-100-90/01-114CNDF-100-90/10-214CNDF-100-90/1-214CNDF-100-90/01-2