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Astronomik

Used - Astronomik 2" Hydrogen Beta Visual Filter


  • 16600
  • Save $ 5600

This item is out of stock but you can place an order now and we’ll ship when it becomes available.


Description

This filter is in excellent condition.

  • Visual observation (dark skies): Very good, but only suitable for a few objects
  • Visual observation (urban skies): Unsuitable
  • Film photography: It depends, very long exposure time
  • CCD photography: Good, when used with an additional IR-block-filter
  • DSLR photography (original): Very good, but only suitable for a few objects
  • DSLR photography (astro modified): Very good, but only suitable for a few objects
  • DSLR photography (MC modified): Good, when used with an additional IR-block-filter
  • Webcam / Video (Planets): Unsuitable
  • Webcam / Video (Deep Sky): Unsuitable

Technical Data

  • typ. transmission of better then 95% at the H-beta line
  • complete blocking of all disturbing wavelengths
  • Main operational use: Hydrogen Nebulae
  • No moisture (humidity) sensitivity, no aging, and totally scratch-proof
  • Excellent carrier material - substrate is optically polished. The optical performance (resolution & contrast) of your telescope is not reduced in any way by the filter.
  • 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!

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