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How to Set Back focus William Optics Zenithstar 81 with field rotator and field flattener #astro
How to set backfocus on the William optics Zenithstar Z61/Z73 (Astrophotography)
William Optics Z61 Adjustable Field Flattener & Back Focus Distance
William Optics Camera Angle Rotator too expensive?
What is BACKFOCUS?? And how to deal with it? - Starting Astrophoto for Lazy People - Ep 8
To flat or not to flat? Assembly and discussion about the WO Zenithstar 73 and its Field Flattener!
Gear Tutorial - 6AIII Filter Installation
William Optics Adjustable Flattener Yes!
Flattener
William Optics Zenithstar Z61 or Zenithstar Z73? Which one?
NEW WILLIAM OPTICS Internal Focus Design - Gran Turismo 81 WIFD
The Telescope Built Like a Camera Lens: WO GT81 WIFD Review