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My official review, WILLIAM OPTICS Zenithstar81 APO telescope using a DSLR n cooled astronomy camera - YouTube
Practical Astrophotography Magazine - Equipment - Telescope/Lens: William Optics ZenithStar 81 Flattener/Reducer: William Optics P-FLAT6AIII Filter: Optolong 2" L-Enhance Light Pollution Filter Mount: Sky-Watcher EQ6-R Pro Guider: Scope: William ...
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William Optics Gold Super Zenithstar 81 f/6.9 Doublet APO Refractor OTA With Case & Free 32mm UniGuide - Rother Valley Optics Ltd
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