Nikon D4 - Manual (Page 228)

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Flash Compensation
Flash compensation can be used with i-TTL or AA flash control
(available with compatible flash units only) to alter flash output by
from –3EV to +1EV in increments of
1 /
3
EV, changing the
brightness of the main subject relative to the background. Flash
output can be increased to make the main subject appear
brighter, or reduced to prevent unwanted highlights or reflections.
In general, choose positive values to make the main subject
brighter, negative values to make it darker.
To choose a value for flash
compensation, press the
M button
and rotate the sub-command dial
until the desired value is
displayed in the top control panel.
M button Sub-command
dial
±0 EV
( M button pressed)
–0.3 EV +1.0 EV