CELESTRON RASA 8" ASTROGRAPH TESTAR20 the image plane of the

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

screw in the provided grub screw through the centre hole so that it is flush with the top side of the base (see below image)

Zeiss Micro Bayonet for use with T2 QuickChanger (QuickChanger sold separately)

f/6 Central obstruction

the SunDancer II provides exceptional resolution

CELESTRON RASA 8" ASTROGRAPH TESTAR20 the image plane of theThe 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