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Coudé Focus Telescope

(type of Nasmyth telescope with additional mirrors)

A Coudé Focus Telescope is a Nasmyth Telescope, i.e., Reflector Telescope with a Tertiary Mirror reflecting the light sideways, with additional optics to bring the light to a non-moving Focal Plane. This is used for very unwieldy instruments to save their having to be moved as the telescope is pointed. Large telescopes may have the option to switch to a coudé focus when their largest instruments are utilized. Examples:

  • 1.5m Hale Telescope
  • Hooker Telescope
  • 200 Inch Hale Telescope
  • Shane Telescope
  • Harlan J. Smith Telescope

(telescope type,reflector)

Referenced by:
Hale Telescope
Reflector Telescope