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Ritchey–Chrétien telescope
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Specialized Cassegrain telescope
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Wikipedia

A Ritchey–Chrétien telescope (RCT or simply RC) is a specialized variant of the Cassegrain telescope that has a hyperbolic primary mirror and a hyperbolic secondary mirror designed to eliminate off-axis optical errors (coma). The RCT has a wider field of view free of optical errors compared to a more traditional reflecting telescope...

Subclass of
Cassegrain reflecting telescope
References
Wikidata