Astronomik CLS Light Pollution Filter - 36mm Round Mounted

Astronomik CLS Light Pollution Filter - 36mm Round Mounted
$99.95
Item # AK-CLS-36
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  • The Astronomik CLS Light Pollution Filter is 36 mm in diameter and 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.
  • The Astronomik CLS Light Pollution Filter is optimized for use with aperture ratios from 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.
  • The Astronomik CLS Light Pollution Filter is suitable for use with telescopes of all aperture sizes.
Description

Details

Astronomik 36 mm CLS Light Pollution Filter
Mounted in Low Profile Non-Threaded Cell

The Astronomik CLS is a budget filter for visual observation, Black & White photography and CCD photographs of nebulae, galaxies and star clusters with astronomical instruments of any size.

The Astronomik CLS 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. 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.

The filters are optimized for use with aperture ratios from 1:3 to 1:15. Transmission losses and chromatic distortions, which are problems with other filters, only appear with Astronomik filters when extremely bright aperture ratios of 1:2 and more are used. The CLS filter is suitable for use with telescopes of all aperture sizes and even works well with binoculars.

The Astronomik CLS Light Pollution Filter is good for use under both dark and urban skies for reducing light pollution made by mercury-vapor lamps. For film photography and modified DLSR use, the CLS filter gives good performance and near perfect color balance. While this filter does perform well with webcam and video equipment under light polluted skies, it is not suitable for planetary use.

Now Mounted in Low Profile Non-Threaded Cell

Sometimes unmounted CCD filters can be hard to handle. The smaller diameters, such as this 36 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 - 36mm Round Mounted Features.

  • 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
  • Parfocal with other Astronomik filters
  • Glass thickness: 1mm
  • Cell thickness: 3 mm
  • Completely 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
Additional Information

Additional Information

SKU AK-CLS-36
Manufacturer Astronomik
Type of Filter Light Pollution Reduction
Filter Usage Imaging, Visual
Single or Set? Single Filter
Filter Size 36mm
Filter Shape Round
Filter Mounted? Mounted
Warranty 10 Year Warranty
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Included Items

Included Items

  • Astronomik Light Pollution Filter - 36mm Round Mounted
  • Plastic Storage Case
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