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Hi Mark
I have a William Optics field flattener for my refractor. Hoping to try it out at Wiruna this weekend, so if you're coming down I can show it to you. This one is definitely a photographic accessory only, there is no way that you could use it with an eyepiece without some modification. It accepts a T-ring on one end to attach the camera and the other end slips into the (2") focuser.
Geoff
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