Beautiful fine resolution and round stars. Good choice for exposure.
Seeing as your tracking is good you could even go 15 minutes ISO400 and go even deeper. Its worth a try.
Was that auto white balance? It could be taste but white balance seems a tad warm. On a Nikon 4800 kelvin worked well. Canon's seem to be a bit browner in hue so perhaps some experimentation there in Lightroom?
The Nikon 85mm F1.8G is one of Nikon's sharpest lenses but can have some colour fringing wide open. I don't see any there so F4 is good. I noticed with my copy CA went around F2.8.
Greg.
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