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interferometrical and other optical tests: 254/2000 10" Ritchey-Chrétien GSO
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interferometrical and other optical tests: 254/2000 10" Ritchey-Chrétien GSO
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File:Diagram Reflector RitcheyChretien.svg - Wikipedia
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Amazon.com : Omegon Ritchey-Chretien Pro RC 154/1370 OTA : Electronics
