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APSc versus Full frame.
I did landscape astrophotography with a D800e. It was great. It also has a great time lapse function which I liked a lot.
In my case I have a Fuji XT2 (APSc) and Sony A7r2 (full frame). I always notice the extra light gathering of the full frame. Size does seem to matter but I don't think your APSc will hold you back from being able to get a great image.
Not sure about the high ISO performance of the D750. I would check that out. D810 has a superlative reputation and that Sony 36mp sensor is divine.
D850 would be the best but its also very expensive. I have seen some astro landscapes with it already and its a solid performer.
Greg.
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