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3" vs 4" vs 5" vs 6" vs 7" Refractor Telescope for Visual and Astrophotography. What's better??? - YouTube
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Amazon.com : Orion EON 110mm ED f/6.0 Apochromatic Refractor Telescope - for Advanced Astronomers Who Want Great Wide-Field Astrophotographic or Visual Performance : Refracting Telescopes : Electronics
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