Nikon D300 User Manual page 141

Exposure compensation can be set to values between –5 EV
1
(underexposure) and +5 EV (overexposure) in increments of / EV.
3
In general, choose positive values to make the subject brighter,
negative values to make it darker.
–1 EV No exposure +1 EV
compensation
At values other than ±0, the 0 at the center of the electronic
analog exposure displays will flash and a E icon will be displayed
in the control panel and viewfinder after you release the E button.
Z
The current value for exposure compensation can be confirmed in
the electronic analog exposure display by pressing the E button.
Normal exposure can be restored by setting exposure
compensation to ±0. Exposure compensation is not reset when
the camera is turned off.
A
See Also
For information on choosing the size of the increments available for
exposure compensation, see Custom Setting b3 ([Exp comp/fine tune],
pg. 275). For information on making adjustments to exposure
compensation without pressing the E button, see Custom Setting b4
([Easy exposure compensation], pg. 276).
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