Optolong Variable Polarizer Filter - 2"

Quality Filter Materials: Schott B260 substrate material from Germany, 2.0mm thick CNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture; Laser-engraved to prevent fading Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition Optolong Filter Manufacturing Processes and Parameters Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces Surface quality, according to MIL-O-13830, is 60/40 95% transmission High value transmission of pass-band and optical density of off-band is assured through Optolong’s planetary rotation system, a homogenous and precise coating procedure Thin metal cells have a clear aperture of 45mm for 2” filters Each filter comes with a plastic case with high pressure EVA case lining