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Gregorian telescope

(type of reflecting telescope)

A Gregorian telescope is a reflector telescope with a concave ellipsoid secondary mirror reflecting through a hole in the center of the primary to a focal plane. A focal plane exists in front of the secondary. It does not flip the image, making it more useful as a terrestrial telescope than some designs. Astronomical examples:


(telescope type,reflector)
http://en.wikipedia.org/wiki/Gregorian_telescope

Referenced by:
reflector telescope

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