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I don’t use calibration frames.
No darks, no bias, no flats. For me they are completely unnecessary. I have no material vignette in my image train, no dust, and dithering takes care of hot pixels and other artifacts when stacking.
I have tried stacking my data with and without calibration frames and see no difference at all. So calibration is something I no longer bother with, and see no detrimental impact on my images.
In fairness, I have a smaller sensor in the 533MM Pro which doubtless makes this easier to get away with.
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