CELESTRON RASA 8" ASTROGRAPH TESTAR20 screw in the provided grub

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)

Optical design Aplanatic Schmidt-Cassegrain Aperture 203

even in apochromatic telescopes as they are not corrected outside the visible spectrum

the SunDancer II provides exceptional resolution

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

CELESTRON RASA 8" ASTROGRAPH TESTAR20 screw in the provided grubThe 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