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Astronomik 1.25" UHC Light Pollution Filter.  Excellent Condition! Very Clean! Comes in original protective case!
Info From Manufacturer:Suitability

  • Visual observation (dark skies): Very good, for telescopes of all apertures and high exit pupil
  • Visual observation (urban skies): Very good, for telescops from 100 mm aperture
  • Film photography: Reasonable, but very long exposure time
  • CCD photography: Good, when used with an additional IR-block-filter
  • DSLR photography (original): Good, colour balance shifted but contrast enhanced
  • DSLR photography (astro modified): Very good, colour balance is near perfect
  • DSLR photography (MC modified): Good, when used with an additional IR-block-filter
  • Webcam / Video (Planets): Unsuitable
  • Webcam / Video (Deep Sky): Good, if light pollution is a big problem

Technical Data

  • typ. 97% transmission at 486nm (H-beta)
  • typ. 97% transmission at 496nm (OIII)
  • typ. 97% transmission at 501nm (OIII)
  • typ. 97% transmission at 656nm (H alpha)
  • optimum position of transmission for telescopes with focal ratios from f/10 to f/3,5
  • Entire Blocking of annoying wavelengths
  • Ideal All-round Deep Sky filter even for small telescopes
  • Not sensitive to humidity or aging
  • Scratch-resistant!
  • Excellent carrier material. The optical performance of your telescope is not reduced by the filter in any way.
  • Parfocal with other Astronomik filters
  • Glass thickness: 1mm
  • Completely resistant against high humidity, scratches and aging effects
  • Diffraction limited, the filter will not reduce the optical performance of your telescope!

Filed under: Eyepieces & Accessories