Nikon D7200 body - Manual (Page 176)

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At values other than ±0.0, a Y icon will be displayed after you
release the M (Y) button. The current value for flash
compensation can be confirmed by pressing the M (Y) button.
Normal flash output can be restored by setting flash
compensation to ±0.0. Except in SCENE mode, flash
compensation is not reset when the camera is turned off (in
SCENE
mode, flash compensation will be reset when another
mode is selected or the camera is turned off ).
A
Optional Flash Units
The flash compensation selected with the optional flash unit is added
to the flash compensation selected with the camera.
A
See Also
For information on choosing the size of the increments available for
flash compensation, see Custom Setting b2 (EV steps for exposure
cntrl,
0 278). For information on choosing how flash and exposure
compensation combine, see Custom Setting e4 (Exposure comp. for
flash,
0 283). For information on automatically varying flash level
over a series of shots, see page 197.