Nikon D750 User Manual page 223

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Using the Built-in Flash
Before taking a photograph with the flash in manual pop-up modes
(0 182), press the M (Y) button to raise the flash and wait for the M
indicator to be displayed in the viewfinder (0 11). Shooting will be
interrupted if the flash is raised while remote control mode is in effect.
If the flash is required, the camera will only respond to the ML-L3
shutter-release button once the flash has charged. In auto pop-up
modes (0 180), the flash will begin charging when remote control
mode is selected; once the flash is charged, it will automatically pop up
and fire when required.
In flash modes that support red-eye reduction, the red-eye reduction
lamp will light for about one second before the shutter is released. In
delayed remote mode, the self-timer lamp will light for two seconds,
followed by the red-eye reduction lamp which lights for one second
before the shutter is released.
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Focusing in Remote Control Mode
The camera will not adjust focus continuously when continuous-servo
autofocus is selected; note however that regardless of the autofocus
mode selected, you can focus by pressing the camera shutter-release
button halfway before shooting. If auto- or single-servo autofocus is
selected or the camera is in live view in delayed or quick-response
remote mode, the camera will automatically adjust focus before
shooting; if the camera is unable to focus in viewfinder photography, it
will return to stand-by without releasing the shutter.
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Remote Mirror-up Mode
While the mirror is raised, photos can not be framed in the viewfinder
and autofocus and metering will not be performed.
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Exiting Remote Control Mode
Remote control is cancelled automatically if no photograph is taken
before the time selected for Custom Setting c5 (Remote on duration
(ML-L3), 0 337), Off is selected for Remote control mode (ML-L3), a
two-button reset is performed (0 199), or shooting options are reset
using Reset photo shooting menu (0 311).
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