CELESTRON RASA 8" ASTROGRAPH TESTAR20 even in apochromatic telescopes as

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

Optical thickness is just 3mm

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

It can be installed on: ASI120MM

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

CELESTRON RASA 8" ASTROGRAPH TESTAR20 even in apochromatic telescopes asThe 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