Quote:
Originally Posted by carlstronomy
Not sure if this helps, but I had donuts not smudges on my images last week. These did not show up on flats, only on my lights. It was dust on the sensor of the camera, a good clean fixed it up. I also could see nothing visually, it does not take much at all to make a huge imprint on your results.
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Trying to image through high cloud or fog will do that! The illumination is different in those frames so the dust bunnies are more pronounced and will show in your calibrated stack.