![]() But modern materials, design, and manufacturing techniques have enabled the production of high-quality RC scopes that are remarkably affordable. Celestron’s FREE planetarium app is an astronomy suite that redefines how you experience the night sky. The difficulty of figuring the optics of an RC meant that these telescopes have, in the past, been prohibitively expensive for amateur astronomers. And they have open optical tubes, which can make it easier to come to thermal equilibrium with their surroundings. They do not require a corrector lens, so they have no chromatic aberration like refractors or Schmidt-Cassegrain telescopes. They have flat fields that provide pinpoint star images right to the edge of the field of view. RC scopes use primary and secondary mirrors ground to precise hyperbolic figures, which means they suffer little of the aberration and coma that plague Newtonian telescopes. I have a Williams Optics 120mm F7.5 (900mmFL) Megrez refractor mounted on a Celestron AVX. Widely used in professional telescopes around the world, the Ritchey-Chretien (RC) design offers many advantages for serious astronomical imagers. 1 bthrel Viking 1 topic starter Posts: 602 Joined: Loc: Linden, TN Posted 28 April 2021 - 10:18 AM Hello, New guy looking to dippiest my toes into EAA. This clever accessory makes it possible to have a dual focal ratio instrument, without sacrificing image quality. ![]() Sky-Watcher GoTo Dobsonian and EQ Mount Sale Product Details This combination focal reducer and field corrector lens accessory works with all Celestron 5', 6', 8', 9 1/4', 11' and 14' Schmidt-Cassegrain telescopes. Product Info Manufacturer Description This combination focal reducer and field corrector lens accessory works with all Celestron 5', 6', 8', 9 1/4', 11' and 14' Schmidt-Cassegrain telescopes.Color Correction & Minus Violet Filters.Correctors, Focal Reducers & Flatteners.
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