Astrophysics (Index)About

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:

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