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Originally Posted by JohnH
I would think you need to leave the OTA focus alone too, that might help blurr out any gradient - better make sure there are no fingerprints on the screen too...
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Hi John
For a Flat Frame, you should not change the focus or any other variable such as camera angle, otherwise the Flat Field image and the real world optical system with all its dust donuts, vignetting and other defects simply will not match up.
Cheers
Dennis