CELESTRON RASA 8" ASTROGRAPH TESTAR20 04x is a universal field

04x is a universal field corrector for FC and FS series fluorite doublet refractors

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

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 thickness is just 3mm

1mm with the Z103) makes it a perfect match for full-frame sensors

CELESTRON RASA 8" ASTROGRAPH TESTAR20 04x is a universal fieldThe 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