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Dia. 52mm Focal Length 243mm Objective Lens Ultra Low Dispersion Diy Telescope | eBay
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Amazon.com : Telescopes for Adults, 70mm Aperture and 700mm Focal Length Professional Astronomy Refractor Telescope for Kids and Beginners - with EQ Mount, 2 Plossl Eyepieces and Smartphone Adapter : Electronics
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How to Make a small Refractor Telescope out of cardboard
