Nikon D780 Reference Manual page 549

3
C : Adjust flash settings.
•
Choose the flash level ([Output]),
the maximum number of times the
flash units fire ([Times]), and the
number of times the flash units fire
per second ([Frequency]).
•
Enable or disable selected groups.
Select [ON] to enable the selected
group, [––] to disable the selected
group.
•
Choose a channel for the master
flash. If the remote flash units
include an SB-500, you must choose
channel 3, but otherwise you can
choose any channel between 1 and
4.
Remote Flash Photography
503