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Ripper image Andrew. I really like it. Gorgeous colours and the star field is divine.
As far as ISO6400 goes. Marianne Oleund who is an engineer and knows a lot about Nikon cameras said there was no gain from going above ISO1600 as its digital gain after that not native ISO. So theoretically that means you would get the best efficiency from the sensor imaging at ISO1600 and boosting in post processing rather than ISO6400 which will lower your dynamic range from the sensor. It also reduces well depth. Perhaps the 810a is different but I doubt Nikon would reprogram their analogue to digital converter for an offshoot model. Anyway that is the theory. You'd have to do 2 images one at 6400 and one at 1600 and process each to know for sure.
I did image long exposure at ISO100 for an hour with the D800e and it seemed to protect stars and colours really well versus say much shorter and high ISO.
Greg.
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