William Optics Z61 Adjustable Field Flattener & Back Focus Distance
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To flat or not to flat? Assembly and discussion about the WO Zenithstar 73 and its Field Flattener!
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Back-Focus 101: The Petzval Lens ft. William Optics RedCat51
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My Last Photography Trip to Morro Bay...
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Telescope Back Focus: The Ultimate Guide [TAIC Short]
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William Optics Z61II Unboxing
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5. Backfocus
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Gear Tutorial - 6AIII Filter Installation
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