Review Celestron – RASA 8 Imaging Filter – H-Alpha, H-Beta, Oxygen III Narrowband Filter – Enhances Emission Nebulae
Review Celestron – RASA 8 Imaging Filter – H-Alpha, H-Beta, Oxygen III Narrowband Filter – Enhances Emission Nebulae
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- Custom engineered filter to work with the Rowe-Ackermann Schmidt Astrograph (RASA) 8 for premium optical performance at f/2
- Narrowband filter that enhances your images by transmitting only the key wavelengths: Hydrogen-Alpha, Hydrogen-Beta, and Oxygen III
- Produces high contrast that makes your astroimages “pop”
- Blocks wavelengths of light associated with light polluted skies and natural sky glow
- Constructed of Schott glass with anti-reflection coatings
Product Description
Bring out the best in your nebulae astroimages with the H-Alpha-H-Beta-OIII Imaging Filter for the 8” RASA. This specialized filter allows high transmission of light from emission nebulae while blocking light pollution and natural sky glow. This helps to make your images pop with detail off the black sky background with superior contrast. The Imaging Filter transmission spectrum is 85% or greater at key wavelengths (486nm, 496nm/501nm, 656nm) and less than 0.5% transmission elsewhere. These wavelengths will make emission nebulae like the North America Nebula (NGC 7000) and Lagoon Nebula (M8) shine with phenomenal detail. The H-Alpha-H-Beta-OIII Imaging Filter is a narrowband filter that blocks much of the visible spectrum and only allows specific wavelengths through. Because of this, it will not work well on broadband emission objects, such as galaxies and star clusters. This filter was custom engineered to work exclusively with the RASA 8” f/2 optical tube to ensure premium optical performance and that essential wavelengths reach your camera’s sensor. The filter features a 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. The filter fits directly into the internal filter mount in the RASA 8’s front lens cell, where the optical window normally mounts. Each filter comes with a spectral transmission graph unique to your specific unit, verifying its performance.
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