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Worlds Best Doublet vs Best Triplet APO Refractor Telescope. Is the Triplet worth the extra cost??? - YouTube
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Amazon.com: Omegon Apochromatic Refractor Pro APO AP 104/650 ED OTA + 2'' Field Flattener : Electronics
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Amazon.com : SVBONY SV550 APO Triplet Refractor, 80mm F6 OTA with 2.5 inches Micro-Reduction Rap Focuser, Astronomy Telescope Adults for Deep Sky Astrophotography and Visual : Electronics
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