Nikon D750 DSLR Camera (Body Only) - Manual (Page 210)

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Manual Pop-up Modes
In P , S , A , M , and 0 modes, the flash must be raised manually. The
flash will not fire if it is not raised.
1
Raise the flash.
Press the M ( Y ) button to raise the
flash. Note that if the flash is off or an
optional external flash unit is
attached, the built-in flash will not
pop up; proceed to Step 2.
2
Choose a flash mode ( P , S , A , and M modes only).
Keeping the M ( Y ) button pressed, rotate the main
command dial until the desired flash mode appears in the
information display.
3
Take pictures.
If an option other than j is selected, the flash will fire
whenever a picture is taken.
M ( Y ) button Main command
dial
Information display
M ( Y ) button