Nikon D300 Complete Manual page 571

orders shown below are correct: extra – and +
compensation values are performed in order of lowest
exposure to highest.
MTR>Under>Over
Under>MTR>Over
Recommendations:
1. Pick one and use only that setting. This is one of those
things where consistency is preferable. Since the D300
names every file only with numbers, this becomes even
more important. (You could browse through the EXIF data
to figure out which is which.)
2. I personally prefer to have my numbered images go from
underexposure to overexposure, so I select
Under>MTR>Over. That's because that's the way I used
to set up bracket sequences on the light box when
reviewing slides. I'm used to seeing values from low to
high.
3. Note that the order applies to flash-only and white balance
bracketing, as well. This is another reason why I like them
in order—any time I see a bracketing sequence of shots, I
know that they go from low to high in whatever is
bracketed.
Thom Hogan's Complete Guide to the Nikon D300
Correct exposure first, then
underexposed, then overexposed
[default]
Underexposed first, then correct
exposure, then overexposed
V1.02
Page 571