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Reflector telescopes, including Dobsonians, typically come with a shorter Focal Length compared to Cassegrain telescopes (that have a longer Focal Length). Weight. Telescopes and Optics Overview... Why do most Professionals choose the Ritchey-Chrétien design? We have to types- Schmidt (SCT) and Maksutov (MAK).
In the Cassegrain reflector, parallel rays of light entering the telescope are
Cassegrain reflector, in astronomical telescopy, an arrangement of mirrors to focus incoming light at a point close to the main light-gathering mirror. The design was proposed in 1672 by French priest Laurent Cassegrain. The Schmidt-Cassegrain telescope is a member of the catadioptric optical family. The design corrects the problem of off-axis aberrations found in reflectors while also minimizing chromatic aberrations. First published telescope arrangements in the U.S. that followed the 1941 introduction of full-aperture meniscus corrector for spherical mirror was a pair of two-mirror Cassegrain systems - ƒ/15 and ƒ/23 - and Maksutov-type corrector by John Gregory in 1957.In it, the secondary was an aluminized spot at the back surface of the corrector. Get ready for some high-power observation and imaging with our new Orion CC8 8" Classical Cassegrain Telescope! Cassegrain telescopes (or catadioptric telescopes) offer versatility and high magnifying power. The Cassegrain design is very popular amongst amateur astronomers, and almost every amateur astronomer will own, at some point in life, the Cassegrain design telescope. The Classical Cassegrain design hasn't gotten much play among amateur astronomers because they haven't been available except in very large sizes at very high prices. A Maksutov-Cassegrain is a catadioptric telescope design that uses a combination of spherical mirrors and a negative meniscus lens to gather and focus light.
They employ both mirrors and lenses that fold the light path, allowing a compact tube length. The schematic of a Schmidt-Cassegrain telescope (credit: Celestron) Then in 1946, an architect and artist named Roger Hayward placed a convex mirror behind the corrector lens of a Schmidt camera to send light out the back of the tube to an eyepiece or a camera, much like Cassegrain’s early design. Equation for a conic centered on the z axis: r2 x2 y2 r = radial coordinate ( ) … An RC has a hyperbolic primary and a hyperbolic secondary mirror. Maksutov-Cassegrain telescopes are very popular, especially in smaller apertures, due to their super portability and beautiful high-contrast views. A Maksutov-Cassegrain, also referred to as a Mak-Cass or more simply, a "Mak" telescope, is a member of the catadioptric telescope family and uses both mirrors and lenses in its folded optical design.
Optical System Design – S15 Reflector Telescopes Joseph A. Shaw – Montana State University Conics A conic is a surface of revolution formed by spinning a conic section around the axis. The Cassegrain has a parabolic primary mirror, and a hyperbolic secondary mirror that reflects the light back down through a hole in the primary. The Ritchey-Chrétien optical design is a specialized Cassegrain telescope designed to eliminate coma, thus providing a relatively large field of view as compared to a more conventional configuration.
Folding the optics makes this a compact design. But all that is about to change. What does this mean – the longer the focus, the higher the magnification. Due to the glass materials used in its design, a Cassegrain is going to be heavier than a Dobsonian. This turned the camera back into a telescope. The Dall-Kirkham has a elliptic primary mirror and a spherical secondary mirror.
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