Nikon D600 and Nikon D800 have some software bugs, to fix them Nikon will soon announce a new firmware update to resolve the issue.
The D600 upcoming software update will fix the Live View aperture bug, at present if you are using D600 Live View, you cannot change the aperture.
The D800 update will fix the focus priority bug (with AF-ON in Live View changing the aperture causes the screen to turn dark)
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Have some time? see more: Nikon D600 vs Nikon D800
source [NR]