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nobody

22 Feb 2019 15:23



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Vezi si aici:
review maksutov 180/2700 (pus chiar pe o montura HEQ5)
Till recent, most of large professional telescopes were of Ritchey-Chrwtien type. Probably the most famous, Hubble Space Telescope, has 2.4m f/2.3 primary mirror, at 4.9m from the convex secondary, and f/24 effective system focal ratio.
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