520-292-5010

Optolong Variable Polarizer Filter - 2"

Optolong Variable Polarizer Filter - 2"

OPT-VPF-2
Adjust the brightness level of the Moon, Venus, and other bright objects with the Optolong Variable Polarizer. A standard Moon Filter is like a pair of shades. They work fine, however in some cases the scene is excessively dull or too bright, and very little can be done about it.
$48.95
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Details

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
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