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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 ParametersFilter 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
Optolong Filter Manufacturing Processes and Parameters