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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)

Referenced by:
Reflector Telescope