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Dennis (and/or anyone else),
I have skimmed this thread -- looked at all the images attached.
I was wondering, if I was to be attempting focus with an ED80 with a William Optics 0.8x field flattener/focal reducer, will I have to buy/make two versions -- one for the native focal length, and one for the reduced focal length -- or will just one suffice for both focal lengths?
Apologies if this has already been definitively answered.
Regards,
Humayun
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