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Astronomik UHC-E Filter - 50 mm Round - UHCE-50R

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Astronomik 50 mm UHC-E Filter

Astronomik UHC-E filters make a great low-cost alternative for viewing deep sky emission nebulae and comets in severe light pollution. This filter is especially well-suited for smaller telescopes up to 5" (125 mm) in aperture. Blocks superfluous light such as that from street lamps, as well as skyglow, while enhancing emission nebulae and comet contrast.

With a 45 nm FWHM (full width at half maximum), the contrast between your target object and the night sky is not enhanced as intensely as with a UHC filter. On the other hand, a greater amount of starlight is allowed to pass through. This makes UHC-E filters better suited for smaller aperture telescopes.

Astronomik UHC-E Filter Highlights

  • This 50 mm Round Filter from Astronomik works best with smaller telescopes that have apertures of up to 5" (125 mm)
  • Increases contrast between deep sky emission nebulae and the background when imaging in heavily light polluted conditions
  • Due to the UHC-E filter's high FWHM of 45 nm, comet observation is attainable when it passes through a spectral line of Carbon
  • 94% peak transmission
  • 480 nm to 525 nm and 645 nm plus transmission range
  • 1 mm thick glass
  • Parfocal with all other filters offered by Astronomik
  • Complete protection from the impacts of scratching, aging, and high humidity is provided via multi-layer coatings
  • Diffraction limited, this filter will not diminish your telescope's optical performance
  • Each Astronomik filter is shipped with a durable plastic storage case of superb quality

Transmission Specifications

  • 94% transmission at 486 nm (H-beta)
  • 95% transmission at 496 nm (OIII)
  • 95% transmission at 501 nm (OIII)
  • 90% transmission at 656 nm (H-alpha)
  • Transmits from 465 nm to 530 nm as well as over 645 nm
  • Blocks all undesirable wavelengths