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Hi Ross!
had exactly the same challenge when moving from DSLR to QHY8.
Also ImagePlus and all other Calibration SW did not work well on that.
Found a way to make out of the 3 bumps on the RAW image only one bump on the Raw image.
Simply, in Astroart or PixInsight move the raw flat 0.5 pixel up and
0.5 right (keeping the image size).
This averages the 3 bumps to one bump.
Histogram Action can only help on Colour images not
on bw raw images. And you want to calibrate the bw raw images
of your colour camera.
Hope this helps.
Gerald
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