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The first large telescope to use the design was the James Gregory Telescope of 1962 at the University of St Andrews. As of 2021, the James Gregory Telescope is also recognized as the largest Schmidt-Cassegrain. [4] The telescope is noted for its large field of view, up 60 times a full moon. [4]
Light path in a Cassegrain reflecting telescope. The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture.
Light path in a Klevtsov-Cassegrain reflector telescope. In the Klevtsov-Cassegrain, all of the optical surfaces are spherical or near-spherical. [1] [2] The secondary Mangin mirror (M 2 ) and the meniscus corrector (C) are held in place by a spider vane and the front of the telescope tube is otherwise open.
The twin 10-meter telescopes at W. M. Keck Observatory in Hawaii, the 8.2-meter Subaru Telescope sited next to them, the four 8.2-meter Unit Telescopes of ESO's Very Large Telescope and their predecessor the 3.6-meter New Technology Telescope are notable examples that support an array of specialized instruments on their Nasmyth platforms, with a similar design being used for the future Thirty ...
Stratospheric Observatory for Infrared Astronomy 24-inch convertible Newtonian/Cassegrain reflecting telescope on display at the Franklin Institute. A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image.
Light path in a Cassegrain Reflector. The Cassegrain reflector is a reflecting telescope design that solved the problem of viewing an image without obstructing the primary mirror by using a convex secondary mirror on the optical axis to bounce the light back through a hole in the primary mirror thus permitting the light to reach an eyepiece.
A beam waveguide antenna is a type of complicated Cassegrain antenna with a long radio wave path to allow the feed electronics to be located at ground level. It is used in very large steerable radio telescopes and satellite ground antennas, where the feed electronics are too complicated and bulky, or requires too much maintenance and alterations, to locate on the dish; for example those using ...
Light path in a meniscus telescope (Maksutov–Cassegrain) Maksutov–Cassegrain telescopes are the most commonly seen design that uses a meniscus corrector, a variant of the Maksutov telescope. It has a silvered "spot" secondary on the corrector, making a long focal length but compact (folded optical path) telescope with a narrow field of view.