Astronomik CLS Light Pollution Filter - 31mm Round Mounted

Astronomik CLS Light Pollution Filter - 31mm Round Mounted
$79.95
Item # AK-CLS-31
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  • The Astronomik CLS Light Pollution Filter is 31 mm in diameter and is mounted in a low profile non-threaded cell for protection and easy insertion into appropriately sized filter wheels and carousels.
  • Blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass thereby eliminating most of the orange glow caused by urban lighting.
  • The Astronomik CLS Light Pollution Filter is optimized for use with filter to aperture ratios of 1:3 to 1:15.
  • All the important emission lines, as well as the spectral region that the very well dark adapted eye can see, can pass through the filter.
  • Ultra tough coatings resist dings, scuffs and scratches.
Description

Details

Astronomik 31 mm CLS Light Pollution Filter
Mounted in Low Profile Non-Threaded Cell

The Astronomik CLS is an excellent filter for black & white and color imaging of nebulae, galaxies and star clusters with astronomical instruments of any size. By blocking the spectral lines of mercury and sodium-vapor lamps, and letting the largest part of the visible light and H-alpha emissions pass, the CLS filter will effectively block out most surrounding light pollution, eliminating that annoying orange glare.

The filters are optimized for use with filter to aperture ratios of 1:3 to 1:15. By remaining within these aperture ratios, aberration and comma are eliminated.

Now Mounted in Low Profile Non-Threaded Cell

Sometimes unmounted CCD filters can be hard to handle. The smaller diameters, such as this 31 mm CLS filter, can be especially difficult to pick up and insert or remove from the filter wheel, and that can lead to possible damage as well as unwanted reflections from incorrectly installed filters. Astronomik has solved this problem by mounting their 31 mm and 36 mm filters in a low profile (3 mm) non-threaded cell. O-rings, washers, or spacers are no longer required to hold the filter in place, and because the cell is only 3 mm thick, it works well in all appropriately sized filter wheels. Mounted 31 mm and 36 mm Astronomik filters will also play nice with unmounted versions in the same carousel.

Astronomik CLS Light Pollution Filter - Transmission Information

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

    Features

  • Parfocal with other Astronomik filters
  • Glass thickness: 1mm
  • Cell thickness: 3 mm
  • Highly resistant against high humidity, scratches and aging effects
  • Diffraction limited, the filter will not reduce the optical performance of your telescope!
  • Astronomik filters are delivered in a high-quality, long lasting, filter box
Astronomik Product Number: CLS-31
Additional Information

Additional Information

SKU AK-CLS-31
Manufacturer Astronomik
Type of Filter Light Pollution Reduction
Filter Usage Imaging, Visual
Single or Set? Single Filter
Filter Size 31mm
Filter Shape Round
Filter Mounted? Mounted
Warranty 10 Year Warranty
Peak Transmission 97% at H-alpha
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Included Items

Included Items

  • Astronomik CLS Light Pollution Filter - 31mm Round Mounted
  • Plastic Storage Case
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