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Representing the largest aperture in the RASA series, the Celestron 14" f/2.2 Rowe-Ackermann Schmidt Astrograph (RASA) is designed for photographing and imaging all kinds of celestial objects—even the dimmest galaxies and whispiest nebulae. The use of 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, it has a massive 60.1mm (2.36") imaging circle that will cover large imaging sensors such as those on medium-format cameras, and a large 48mm camera T-adapter is included for easy camera mounting.