Nikon D800 - Manual (Page 212)

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Flash Compensation
Flash compensation is used to alter flash output by from –3 EV to
+1 EV 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. If flash compensation is
combined with exposure compensation (
0 130), the exposure
values will be added together.
To choose a value for flash compensation, press the M (Y) button
and rotate the sub-command dial until the desired value is
displayed in the control panel.
At values other than ±0.0, a Y icon will be displayed in the control
panel and viewfinder after you release the M (Y) button. The
current value for flash compensation can be confirmed by
pressing the
M (Y) button.
M (Y) button Sub-command dial
±0 EV
( M (Y) button
pressed)
–0.3 EV +1.0 EV