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Astronomik CLS Light Pollution Filter - 36 mm Round - CLS-36

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Astronomik 36 mm CLS Light Pollution Filter

  • Eliminates the resulting orange glare from urban light pollution by permitting the largest section of visible light and H-alpha emissions to pass while obstructing the spectral lines of mercury and sodium-vapor
  • Displays more star and nebula characteristics
  • Works best with telescopes that have a filter to telescope aperture ratio of 1:3 to 1:15
  • Round 36 mm format
  • The Astronomik 36 mm CLS Filter provides close to 100% transmission between 450 nm and 530 nm which encompasses the visual and h-alpha part of the spectrum
  • Astronomik filters have multi-layer coatings for protecting against scratching, aging and high humidity
  • Made in Germany, a country renowned for their high-quality optics!

More About the Astronomik 36 mm CLS Filter:

For imaging deep sky objects like star clusters, nebulae and galaxies in black & white as well as color with astronomical equipment of any size, the Astronomik CLS Filter is an excellent choice. By blocking the spectral lines of mercury and sodium-vapor lamps, and letting the largest part of the visible light and H-alpha emissions to pass, the CLS filter cuts off most surrounding light pollution, eliminating that annoying orange glare. Developed for use with filter to aperture ratios of 1:3 to 1:15. By staying within these parameters, aberrations and coma are eliminated.

Astronomik filters are parfocal with other Astronomik filters. The Astronomik 36 mm CLS Light Pollution Filter has a thickness of only 1 mm. It is highly resistant to scratches and aging effects, as well as high humidity. Diffraction limited, the filter will not reduce the optical performance of your telescope! Astronomik filters include a high-quality, long lasting, plastic storage box.

Transmission Specifications:

  • 92% transmission at 486 nm (H-beta)
  • 92% transmission at 496 nm (OIII)
  • 92% transmission at 501 nm (OIII)
  • 97% transmission at 656 nm (H alpha)
  • Pass from 450 to 540 nm and beyond 650 nm