Nikon D800 - Manual (Page 154)

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Exposure Compensation
Exposure compensation is used to alter exposure from the value
suggested by the camera, making pictures brighter or darker. It is
most effective when used with center-weighted or spot metering
(
0 115). Choose from values between –5 EV (underexposure) and
+5 EV (overexposure) in increments of 1 /
3
EV. In general, positive
values make the subject brighter while negative values make it
darker.
To choose a value for exposure compensation, press the E button
and rotate the main command dial until the desired value is
displayed in the viewfinder or control panel.
–1 EV No exposure
compensation
+1 EV
Main command
dial E button
±0 EV
( E button pressed)
–0.3 EV +2.0 EV