ND Optical Filter, Circular Variable Metallic, N-BK7, 127 mm, 0.05-1.0 OD

The 50G02AV.1 Circular Variable Metallic ND Filter is a circular variable metallic neutral density filter, made of N-BK7 glass. It is 127 mm in diameter with surface flatness of ≤1λ , and coated for an OD range of 0.05-1.0. 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.