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Sadly the only camera I currently have capable of testing with is my D700 and for whatever reason I cannot get a FWHM lower than 2.8 with it regardless of the scope or lens being used. I get 2.8-3 pixel FWHM at 24, 35, 50, 85 and 680mm. Not sure what it is with my D700 but it doesn't seem to under sample :/
With my QHY22 I am imaging at 1.39"/ pixel so unless I get some seeing like you've had, I cannot really test more than 2x2 drizzle.
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