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The 20-cm Schmidt-cassegrain Telescope
This is a guide to the use of the compact, 20-cm (8-in) Schmidt-Cassegrain telescope which has revolutionized amateur astronomy and astro-photography. Manly ... »
This is a guide to the use of the compact, 20-cm (8-in) Schmidt-Cassegrain telescope which has revolutionized amateur astronomy and astro-photography. Manly ... »
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