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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.