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The 6D is renown for it's low noise, but most of the Canons are pretty good when the ambient temp is below 10C. But come Spring/Summer, oh boy, the noise can be atrocious.
Darks frames are essential. At the end of each session I would pop a fresh battery in the camera and let it take darks until the battery runs out. Add those darks to your library and add more the next night and the next. Turn them all into one master dark frame to add to DSS.
Take them at all the ISO's you will use.
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