Foment 发表于 2025-3-25 04:52:56
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Newtonian and Cassegrain Telescopes,t is situated in front of the primary and directs the converging cone of light arriving from the primary out of the tube for visual or photographic applications. The aperture stop . coincides with the rim of .. (see Figure 4.1).flammable 发表于 2025-3-26 05:31:27
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