 Ritchey–Chrétien telescope (source code)

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= Ritchey–Chrétien telescope
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= Ritchey–Chrétien reflector
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A Ritchey–Chrétien telescope has hyperbolic primary and secondary mirrors chosen to cancel third-order <spherical aberration> and <coma>. It retains <astigmatism> and <field curvature>; wide-field instruments may require additional correction.

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