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Dark and Light and Fridges
The first image is a dark. the second a light and the third light minus dark.
The fourth is a dark at 20C.
These are all the same region at 100% crop.
All were eight minute exposures at 200 ISO with the Canon 5DH. The fridge the camera was in was at -12C.
All were processed exactly the same before subtraction.
Bert
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