Hi I have an "old" Sony A7S. I really like the colours it captures in low light. For nightscapes I am always surprised by the colour or the sky and how much it varies due to sky glow. I tend to use ISO 6400 or less, I abide by the rule of 500 (or in my case, a rule of 250 :-) ) and to date I have been too lazy to stack and calibrate images. So what you see are single frames with in camera dark subraction, or multiple dark subtracted single frames stitched in LR. I also have started to use some of the Topaz Labs plugins, in particular Topaz Sharpen AI and Topaz DeNoise AI. Cheers.
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