In the compact form, the corrector plate is located at or near the focus of the primary mirror. While there are many variations of the Schmidt–Cassegrain telescope design (both mirrors spherical, both mirrors aspherical, or one of each), they can be divided into two principal types: compact and non-compact.
#NEWTONIAN TELESCOPE ZEMAX FILE FULL#
The telescope is noted for its large field of view, up 60 times a full moon. The first large telescope to use the design was the James Gregory Telescope of 1962 at the University of St Andrews.Īs of 2021, the James Gregory Telescope is also recognized as the largest Schmidt-Cassegrain. Some designs include additional optical elements (such as field flatteners) near the focal plane. In this Cassegrain configuration the convex secondary mirror acts as a field flattener and relays the image through the perforated primary mirror to a final focal plane located behind the primary. As in the Schmidt camera, this design uses a spherical primary mirror and a Schmidt corrector plate to correct for spherical aberration.
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The optical shop at Mount Wilson Observatory manufactured the first one during World War II as part of their research into optical designs for the military. The American astronomer and lens designer James Gilbert Baker first proposed a Cassegrain design for Bernhard Schmidt's Schmidt camera in 1940.
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View of the corrector and primary mirror of a Schmidt–Cassegrain.