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Thanks guys.
I've been using a W.O P-FLAT2 flattener/0.8reducer with my ED80, but I suspect it might be a little to aggressive for the GSO RC-8, which I understand has a reasonably flat focal plane.
Paul - I've seen some of your wide field RC-8 shots, and they look pretty sharp to me. Which Tak flattener have you been using?
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