Nikon D780 DSLR Camera (Body Only) - Manual (Page 540)

494 Remote Flash Photography
Remote flash units can be controlled via
optical signals from an optional flash unit
mounted on the camera accessory shoe and
functioning as a master flash (optical AWL; for
information on compatible flash units, see
“The Nikon Creative Lighting System”,
0 798). If the flash unit in
question is an SB-5000 or SB-500, settings can be adjusted from
the camera (
0 495); otherwise settings must be adjusted using
flash unit controls as described in the documentation provided
with the unit. For information on flash placement and other
topics, see the documentation provided with the flash units.
Optical AWL