Nikon D780 DSLR Camera (Body Only) - Manual (Page 518)

472 On-Camera Flash Photography
3
Set the flash unit to the appropriate mode.
Turn the flash unit on and select [ TTL ] or [ Auto external
flash ] for [ Flash control ] > [ Flash control mode ] (SB-5000,
SB-500, SB-400, or SB-300) or set the flash control mode to
TTL, monitor pre-flash
q A , or monitor pre-flash A (other
flash units; see the documentation provided with the flash
unit for details).
4
Focus.
Position the subject in the center of
the frame and press the shutter-
release button halfway to focus.