Definition of Cassegrain telescope in English:

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Cassegrain telescope

Pronunciation: /ˌkasəɡrān ˈteləskōp/


A reflecting telescope in which light reflected from a convex secondary mirror passes through a hole in the primary mirror.
Example sentences
  • Visitors can also see the University Observatory, which houses a 14 inch Schmidt Cassegrain telescope with a cooled CCD (Charge Couple Device) camera.
  • The tube length is very long compared to a Cassegrain telescope of the same effective focal length.
  • Easy portability and precision optics are hallmarks of Cassegrain telescopes, and Orion has some of the finest.


Late 19th century: named after N. Cassegrain (1625–1712), the French astronomer who devised it.

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