Celestron 8" RASA OTA with Ha/Hb/O III and Light Pollution Filter Imaging Kit

The Celestron 8" f/2.0 Rowe-Ackermann Schmidt Astrograph (RASA) is specifically designed for astrophotography and astro-imaging with a large aperture and fast focal ratio. Using four-element rare-earth optical glass lenses ensures accurate color rendition and eliminates aberrations such as coma and field curvatures. The improved StarBright XLT multi-coating system, which includes anti-reflection coatings on the lenses and highly reflective coatings on the mirrors, increases light transmission throughout the entire optical path. An integrated fan reduces cooldown time and provides optimal airflow through the optical tube assembly (OTA) while filtering harmful dust from the interior.

The astrograph design is defined by its fast focal ratio, which reduces exposure times without sacrificing image quality and gives you more time for multiple shots of the same object for layering or with different filters. Its internal Ultra-Stable focusing mechanism enables very precise focusing to clearly resolve topographic details on the Moon or split double stars and reveal details of most other celestial objects in between, while minimizing unwanted lateral movement of the primary mirror when focusing or slewing. Since this OTA is designed as an imaging scope, a 42mm camera T-adapter and C-mount imager adapter are included that are compatible with most camera-specific T-rings that are widely available.

Designed specifically for their 8" Rowe-Ackerman Schmidt Astrograph (RASA) telescope, Celestron's Narrowband H-alpha / H-beta / O III Imaging Filter blocks all but three wavelengths of light to improve your shots of wispy nebulae like the NGC 7000 North America, M8 Lagoon, M42 Orion, and the NGC 3372 Carina.

Purpose built for their 8" Rowe-Ackermann Schmidt Astrograph (RASA) Telescope, the Celestron Light Pollution Imaging Filter replaces the optical tube assembly's (OTA's) optical window and maintains its optical performance and neutral color balance, as no extra piece of glass is added to the fast optical system. By fitting onto the front, the light is filtered before entering the optical tube, maximizing usable light and eliminating the need for a rear filter, which can add length and weight to your astrophotography or astro-imaging rig.

The filter selectively removes unwanted light pollution�such as that from high- and low-pressure sodium-vapor streetlights, mercury-vapor streetlights, and natural airglow caused by oxygen in the atmosphere�while allowing more overall light transmission to pass through the optical path to the imaging sensor. By blocking targeted wavelengths, specific ones including 656nm H-?, 486nm H-?, 496nm and 501nm O-III, and 672nm SII emission lines from nebulae are highly transmitted, so emission nebulae won't be dimmed.

Made with Schott B270 glass, the filter's anti-reflection coatings maximize light transmission to bring out subtle color in nebulae, galaxies, and other faint deep-sky objects, while preventing star halos. Every filter is individually tested for light transmission, and a graph of test results for your specific filter is included for your reference.

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