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stacking images
Just trying to get my head around why stack multiple images.
Assuming you have perfect tracking and same exposure per image theoretically each image made should be exactly the same. Why not just stack the same image?
I have also read a little about thermal noise and it would seem the last image can tend to be noisier than the first so the latter images will be of a lesser quality.
I get the need for darks (to map noise reduction) and i think flats (to aid in alignment and reduce distortion?)
What am i not getting?
Robert
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