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Hi,
I think when they say take 5 times as long darks as lights they dont mean take one dark 5 times as long they mean take 5 darks as long as the light.
If you go longer then you will get a different hot pixel response and would be removing good data because the dark would have many many more hot pixels.
You stack images to average noise and you should also stack darks to average noise as well.
If you go longer DSS for example will try and scale but this is not optimal.
Paul
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