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Ritchey-Chrétien telescope

Ritchey-Chrétien is a type of astronomical telescope. It is a specialized Cassegrain[?] reflector with the advantage that it is coma free. This is why almost every professional reflector telescope in the world is of the Ritchey-Chrétien design. It was invented by George Willis Ritchey and Henri Chrétien in the early 1910's.

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