Celestron 36 cm RASA Astrograph OTA

Optimally suited for scientific applications such as space surveillance and Space Situational Awareness (SSA), as well as for advanced wide field astrophotography, this Rowe-Ackermann Schnmidt Astrograph is also practical from a cost perspective. This optical system provides fantastic value in terms of speed, aperture, field of view, and overall optical performance. The RASA design features a convenient external location with a flat focal plane for prime-focus image capture, allowing small spot sizes to the outskirts of a wide field resulting in images void of optical blemishes such as field curvature, off-axis coma, and astigmatism.

The 36 cm aperture version is the largest RASA Celestron manufactures. It is both the biggest and fastest (f/2.2) optical instrument of its kind available “off-the-shelf.” Unlike most telescopes, which only focus visible light (400-700 nm), the RASA 36 cm focuses an extended spectral range (400-900 nm), allowing a brighter signal to be detected by a camera sensor. The 36 cm RASA also features a redesigned focus system, which ensures easy and stable focusing.

With a substantial 77.5 mm back-focus, the Celestron 36 cm RASA is compatible with a wide range of imaging sensors. The addition of a custom camera adapter enhances the field of view up to 4.4 degrees.

Additional Features

• Consisting of high transmission multi-coatings for lenses, along with highly reflective aluminum coatings, Celestron's proprietary XLT coatings enable reliably solid optical system light throughput.
• A built-in cooling fan helps cool down optics to ambient temperature while pulling air through micromesh vents for dust ingress prevention.
• Comes with dual dovetail mounting bars for the ability to mount both an optical tube and additional accessories. Compatible with "CGE/Losmandy" style dovetails.
• A pair of 2x threaded insert hole sets in the rear cell allow even more mounting options.
• Rear cell features carrying handles for convenient optical tube movement.
• Although not normally needed, there are three sets of push-pull screws to adjust the lens group to achieve optical alignment for the entire system.
• M48 camera adapter included.
• Motor system specifically designed for the 36 cm RASA focuser is manufactured by Starlight Instruments.