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Gregorian telescope

(type of reflector 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 behind the primary. A focal plane exists between the primary and secondary, but the light is allowed to continue. The second focal plane (the one that is used) has an "un-flipped" image, making the design more useful for non-astronomical uses than some others. Astronomical examples:


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

Referenced by pages:
Green Bank Telescope (GBT)
reflector telescope
telescope type

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