Gear Tutorial - 6AIII Filter Installation
21:19
Introducing the William Optics GT81iv Refractor Telescope
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William-Optics AP81 Zenithstar ED + FLAT6AIII
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Gear Unboxing - William Optics GT71
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Filters for Deep Sky Astrophotography
57:15
Телескопы Sky-Watcher Evostar ED | Sky-Watcher – видеообзор
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William Optics GT81 Image Scale
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Back-Focus 101: The Petzval Lens ft. William Optics RedCat51
8:00