How are you processing? I have not noticed these in my 1600mm-c images. Are you using DSS? There is a cosmetic cleanup to remove any remaing hot/cold pixels in the final registered image. I must admit i don't examine individual subs too closely, other than grading them in both SGP and DSS, and discarding on that basis. I agree dithering could help, but found i have not had to use it on the 1600, my old Canon yes, jt had to be dithered.
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