The 11" f/2.2 Rowe-Ackermann Schmidt Astrograph with CGEM DX Mount from Celestron combines an 11" f/2.2 Rowe-Ackermann Schmidt catadoptric optical tube assembly (OTA) and a computer-controlled motorized equatorial mount, with a heavy-duty stainless steel tripod to create a rig specifically designed for astrophotography and astroimaging.
The OTA uses Celestron's improved proprietary StarBright XLT multi-coating system that increases light transmission throughout the entire optical path with anti-reflection multicoated lenses, highly reflective multicoated mirrors, and 4-element rare-earth glass. The 70mm imaging circle is made to cover today's large DSLR and CCD imaging sensors to capture full-frame shots without vignetting. Its fast focal ratio reduces exposure times without sacrificing image quality, and gives the user more time for multiple shots of the same object for layering or with different filters, or to change subjects completely. A custom-designed 10:1 linear brass focuser enables very precise focusing to clearly resolve topographic details on the Moon, virtually remove comas and corona from distant stars, and reveal details of most other celestial objects in between.
To find, track, and control the OTA it is attached to the CGEM equatorial mount. This computer controlled and motorized mount uses the NexStar hand controller with a 40,000+ database, multiple alignment procedures, and full Go-To capabilities. To enhance the imaging clarity the controller has Programmable Periodic Correction (PEC), low vibration low-cog servo motors, steel worm gear and brass wheels, and autoguide and auxiliary ports.
Supporting the mount and OTA is a heavy-duty adjustable-height tripod with 3" stainless steel legs equipped with vibration-dampening feet. The feet are bright orange to make them highly visible in low light, reducing the possibility of tripping over them and ruining a shot. An accessory tray helps keep accessories and equipment organized, and a holder for the NexStar controller is also included.