Celestron H-Alpha H-Beta OIII Imaging Filter for 8" RASA

Perfect for Imaging Emission Nebulae: The H-Alpha/H-Beta/OIII Imaging Filter for the 8-inch RASA is perfect for imaging emission nebulae like the North America Nebula (NGC 7000), Lagoon Nebula (M8), Orion Nebula (M42), and the Carina Nebula (NGC 3372) Blocks Light Pollution: This specialized filter allows high transmission of light from emission nebulae while blocking light pollution, helping to make your images pop with detail off the black sky background with superior contrast Narrowband Filter: The H-Alpha/H-Beta/OIII Imaging Filter for the 8-inch RASA is a narrowband filter that blocks much of the visible spectrum and only lets specific wavelengths through. Because of this, it will not work well on broadband emission objects, such as galaxies and star clusters Design and Body: The filter is machined aluminum black anodized cell with knurled rim for easy grip during installation. An anti-reflection coating has been added to the filter to help suppress reflections on the glass Storage Case: Each filter comes with a foam-lined plastic storage case and retaining ring to safely store the filter or the placeholder optical window 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