Nikon D780 DSLR Camera (Body Only) - Manual (Page 516)

470 On-Camera Flash Photography
Adjusting Flash Compensation
Hold the N ( Y ) button and rotate the sub-command dial. The
selected option will be displayed in the monitor, control panel,
and viewfinder.
• Flash output can set to values of from −3 to +1 EV.
• At default settings, changes to flash output are made in
increments of
1 /
3
EV. The size of the increment can be selected
using Custom Setting b1 [ EV steps for exposure cntrl ].
• In general, choose positive values for brighter lighting,
negative values to ensure that the subject is not too brightly
lit.
• Normal flash output can be restored by setting flash
compensation to ±0.0. Flash compensation is not reset when
the camera is turned off.