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There are six optical telescopes on the summit of the Sierra San Pedro Mártir at the OAN complex: [6] The 2.12 m (83 in) telescope was built between 1974 and 1979 and is tied as Mexico's largest optical telescope. It has a Ritchey-Chrétien (RC) design, with secondary mirrors of f/7.5, f/13.5 or f/30.