Nikon D850 - Flash Compensation

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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. 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
W (M) 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 W (M) button.
The current value for flash compensation can be confirmed by
pressing the W (M) button.
Normal flash output can be restored by setting flash
compensation to ±0.0. Flash compensation is not reset when the
camera is turned off.
Flash Compensation
±0 EV
(W/M button pressed)
–0.3 EV +1.0 EV
W (M) button Sub-command
dial