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Hi Raymo, i think you are already using DSS to stack your images?
The easiest thing to do would be to take some darks. Just put the lens cap on or the scope dust cover and shoot about 10 - 20 shots with the same exposure length and iso that you have been using.
Thats all you need to do. When going into DSS, you have to select your light frames as usual, the only extra step is to select your dark frames too. Then let the program do its thing. It will automatically make a 'master dark' which you can use for a few months (or simply select the frames again for the next target you use).
cheers
Rusty
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