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I don't know about the D8010a but the D800 had an issue with flats. Because there is some sort of scaling done it throws off the flats.
Perhaps a D810a owner can comment if that is an issue or not.
The D810a is a very expensive camera. Its something like US$3500.
Its the same sensor in the Sony A7r with Nikon tweaks and slightly better Nikon firmware.
Its also the same sensor in the Pentax K1 and now the K11. The Pentax is cheap. So is a 2nd hand Sony A7r. I have seen a modded A7r for US$1600.
You can also get the same sensor in a QHY cooled camera for similar money.
That would be the better choice for telescope imaging. Atik may also offer a version - not 100% sure.
Greg.
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