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Amazon.com : Sky-Watcher EvoStar 80 APO Doublet Refractor – Compact and Portable Optical Tube for Affordable Astrophotography and Visual Astronomy (S11100) : Refracting Telescopes : Electronics
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FPL-53 Doublet vs Triplet, is there noticeable difference in imaging? - Page 2 - Refractors - Cloudy Nights
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