Quote:
Originally Posted by dugnsuz
Thanks for the comments and ideas - the "hot pixel drift" theory looks the most plausible. Just can't understand why the effect is repeated over the whole image with varying degrees of brightness/intensity.
Thought the effect would be confined to one spot.
Doug
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It is multiple hot pixels. The intensity of each one will vary depending on how hot it is.
If you use a pixel mask to remove the hot pixels as well as a dark frame it stops this happening.
Not all reducing software allow pixel masks but lots do.
Examples that I know of that do are Iris, Mira and AIP4WIN.