![]() The integrated 12V DC MagLev fan reduces cooldown time and provides optimal airflow through the dust filtered optical tube.Įngineered as a complete astroimaging system, every component of the RASA 11 V2 is optimized for peak performance with DSLR and astronomical CCD cameras. The USFS is also compatible with the optional Celestron Focus Motor (#94155-A). ![]() The bearing serves to minimize focus shift (unwanted lateral motion of the primary mirror during focusing which causes shifting of the image) and mirror flop (movement of the primary mirror when the telescope is pointing to different positions in the sky). At the heart of this system is a precision linear ball bearing. RASA 11 V2 utilizes the new Ultra-Stable Focus System (USFS). The design also provides minimal vignetting. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range-or even that of a much more expensive instrument. The RASA 11 V2 features optics with 4-element rare-earth glass for images free of false color and aberrations like coma and field curvature. Optical performance for huge sensors with diagonals of up to 52mm wide is still excellent.Ĭombine this large image circle with a focal length of just 620mm and you have an instrument suitable for wide-field imaging, creating huge mosaics of the night sky, surveying, and even comet hunting. Today, with CCD sensor sizes as large as film or larger, the RASA 11 V2 offers a 43.3mm optimized image circle to capture pinpoint stars on the largest imaging chips. RASA 11 V2 builds on the legacy of Celestron’s Schmidt Cameras, which allowed astrophotographers to produce images with much shorter exposure times on film in the 1970s. In many cases, autoguiding will not be required. The short focal length also lessens equatorial tracking demands. ![]() Because shorter sub-exposure times are possible, your equatorial mount won’t need to accurately track over extended periods. This fast, wide-field f/2.2 system allows for shorter exposure times compared to traditional f/10 astroimaging, without sacrificing resolution. Capturing impressive deep-sky astroimages is easier than ever with Celestron’s Rowe-Ackermann Schmidt Astrograph (RASA) V2, the perfect companion to today’s top DSLR or astronomical CCD cameras.
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