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Celestron Light Pollution Imaging Filter for 8" RASA

SKU: CLS-93614

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  • Enhance your CGX Equatorial 800 RASA (Rowe-Ackermann Schmidt Astrograph) Telescope by blocking light pollution, improving image contrast, and darkening the sky background

  • This filter selectively blocks wavelengths of light from sources of light pollution (such as streetlights)

  • Does not block wavelengths associated with emission nebulae, keeping your nebula images bright and detailed.

  • Fits into the 8” RASA’s integrated filter mount, maintaining peak optical performance.

  • Optically flat surfaces free of defects, constructed of Schott glass with anti-reflection coatings.

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Regular Price: $670.00

Special Price $619.95

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Light pollution in the night sky can significantly degrade contrast in astronomical images. This especially affects fast telescopes like the 8” RASA because the sky background saturates very quickly. The “noise” of the light pollution overwhelms the “signal” from the celestial object you are imaging, making it difficult to get the most detailed image. This light pollution imaging filter remedies this by blocking light pollution while keeping the light from deep-sky objects. The result is bright, detailed objects that pop off the black sky background with superior contrast!

The Light Pollution Imaging (LPI) Filter for the 8” RASA blocks light from some of the most common sources of light pollution between 400-700nm (i.e., the visible spectrum), including high- and low-pressure sodium-vapor streetlights, mercury-vapor streetlights, and natural airglow caused by oxygen in the atmosphere. By strategically blocking certain wavelengths, the filter greatly reduces the effects of light pollution without degrading overall image quality. The filter helps to maintain image brightness and colour balance. In addition, specific wavelengths associated with emission nebulae, such as H-α(656nm), H-β (486nm), OIII (496nm and 501nm), and SII (672nm), are highly transmitted, ensuring minimal loss of image brightness for those objects.

The filter fits directly into the internal filter mount in the RASA 8’s front lens cell, where the optical window usually mounts. To maintain optimal optical performance, remove the clear window and replace it with the filter.

Each filter comes with a plastic storage case to safely store the filter or the placeholder glass that came with your RASA when not in use. You will also receive a spectral transmission graph unique to your specific unit, verifying its performance.


Material Schott B270
Glass thickness 1.9mm
Filter diameter 46mm
Clear aperture 43mm
  • Dichroic
  • Multi-layer anti-reflection
  • Aluminium
  • Black anodised

About Celestron
Celestron was founded by Tom Johnson whose first telescope design was a simple 6-inch reflector, built for his young son. He gradually progressed to making larger scopes in more sophisticated designs. Today, the Celestron company is an industry leader in designing and manufacturing optical equipment including telescopes (computerised and non-computerised), binoculars, spotting scopes and its accompanying accessories. Celestron's legacy spans 50 years, and has grown to enjoy recognition from amateurs to serious astronomers globally. The company seeks to remain innovative by growing its product offerings, while supporting science education around the world.

Additional Information

Additional Information

Optical Design No
Compatibility No
Focal Length No
Exit Pupil No
Eye Relief No
Field of View (Apparent) No
Number of Elements No
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Warranty Information Not provided by Celestron
Additional Specifications of Product No
Loupe Colour No