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Related to Cassegrain telescope: Newtonian telescope
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Synonyms for telescope

Synonyms for telescope

crush together or collapse

make smaller or shorter

References in periodicals archive ?
A Cassegrain telescope uses a dual-mirror system to compress a long optical path into a squat tube well suited to visual and photographic studies of the Moon and planets.
Gregorian and Cassegrain telescopes send the light backward through a hole in the primary mirror, while Newtonian reflectors send it out the side of the tube.
Although Cassegrain telescopes are generally thought of as planetary scopes, the f/9 focal ratio of Jim's design also makes it a good deep-sky hunter capable of delivering a true field of more than 1[degrees] across.