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This is an excellent - admirable - night shot of Arch Rock!
Within a 2 - 3 minutes exposure, stars may still look like points, unless when zooming in one may already see small trails, but the effect also depends on the particular region of the sky one is looking at: the closer a star is to the (north or south) celestial pole the smaller is its trail (compared to other stars in a greater distance). From this position in front of Arch Rock, I recall, one is looking up towards appr. northeast, hence, the pole star should not be so far away...
Anyway, I checked out your excellent evaluation and comparison of the MK III versus the D800 (appreciate a lot that you tackled and emphasized the "noise in shadows" issue, very valuable!, letting me ponder - very seriously - whether I should switch from Canon to Nikon or not sooner or later... ) - how about your experience employing the MK III side by side with the D800 and D800E regarding star trails (long exposures during night)? Which of them perform better regarding noise? Does the D800E apply maybe (more) moiré to star trails rather than the D800?
p.s. if you like check out my shots of Arch Rock and the adjacent rocks taken with the old 5D around 2,5 years ago (I like the view from a slightly different angle as well because there the rock resembles a skull):