ND Optical Filter, Circular Variable Metallic, UV Silica, 127 mm, 0.05-2.0 OD

The 50Q04AV.2 is a circular variable metallic neutral density filter, made of UV grade fused silica, 127 mm in diameter, surface flatness of ≤1λ/2, and coated for an OD range of 0.05-2.0.


Our circular variable neutral density filters are designed to simplify attenuation and beam splitting in the visible to NIR. The variable attenuation and beam splitting around a 270° circle is achieved by a thin, reflective aluminum film. A broadband, visible AR coating on the back side allows the filter to be left in the beam path at all times with minimal losses or ghost images. Circular variable ND filters are available with BK 7 substrates for general laboratory use, or UV fused silica substrates for maximum thermal stability.