Nikon D750 User Manual page 136

D
Using the Built-in Flash
Before taking a photograph with the flash in modes that require the
flash to be raised manually, press the M (Y) button to raise the flash
and wait for the M indicator to be displayed in the viewfinder (0 182).
Shooting will be interrupted if the flash is raised after the self-timer has
started. Note that only one photograph will be taken when the flash
fires, regardless of the number of exposures selected for Custom
Setting c3 (Self-timer; 0 337).
A
See Also
For information on choosing the duration of the self-timer, the number
of shots taken, and the interval between shots, see Custom Setting c3
(Self-timer; 0 337). For information on controlling the beeps that
sound when the self-timer is used, see Custom Setting d1 (Beep;
0 338).
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