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Amazon.com : William Optics RedCat 51 II U 51mm f/4.9 Petzval Apo Refractor Telescope - Red #L-RC51II-U : Electronics
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William Optics GT71 f/5.9 FPL-53 Triplet APO Refractor w/Flat6AIII Field Flattener & 32 mm UniGuide - Red
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William Optics - Redcat 51 F/4.9 Petzval Refracting Telescope - Version 2.5 - Modified Tilt Adapter | Telescopes
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