CELESTRON RASA 8" ASTROGRAPH TESTAR20 f/6 Central obstruction

f/6 Central obstruction

Optical thickness is just 3mm

via the 10Micron ASCOM driver or the Meade compatible command protocol

the image plane of the camera and eyepiece is about 24mm behind the two T-2 threads of the BFM II

CELESTRON RASA 8" ASTROGRAPH TESTAR20 f/6 Central obstructionThe Celestron RASA 8" Rowe Ackermann Schmidt Astrograph is an incredibly fast f 2 optical system designed for imaging with modern CMOS cameras. The RASA 8" provides a flat field free of optical aberrations across a 22mm field of view, with usable performance up to 32mm making it suitable for APS C and smaller sized sensors. Note: the RASA 8" cannot be used with systems requiring filter wheels or large DSLR bodies. Instead, it is recommend to use