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| p.1 #3 · D600 and D800 high ISO in dark setting samples? |
IMO underexposed areas of high-iso d800 shots are very noisy unless you scale down the image and/or print small (which I do not). You might also get amplifier noise in some areas if you try to boost the dark areas too much.
At low iso, underexposed areas can be recovered by several stops with relatively little noise because the DR of the camera at low iso is huge.
The limiting factor is the shutter speed that you can use. Even high iso is ok if the shutter speed can be slow enough to avoid underexposure.