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well, I took a series of darks and flats of the correct gain and duration.
In a first rerrocess with the darks the hot pixels were removed and the colour of the output mage was much improved. but dust halos remained,
The second reprocess had the flats loaded ,during processing dire sounding warnings about the lack of a master dark were given. But the output image was again much improved, see the attached image.
Co the next question, how do you make a master dark?
Chris
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