Nikon D4S - Manual (Page 56)

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Synchronized Release Options
The following options are available for synchronized release:
Group name, Master/remote, Remote camera check, and
Number of remote cameras. To view synchronized release
settings, select Network > Network settings in the setup menu,
highlight Synchronized release, and press
W.
❚❚Master Camera
Configure the master camera as follows:
Group Name
Enter a group name of up to 16 characters
(
011). The master and remote cameras must
all be in the same group.
Master/Remote
Select Master camera to designate the
current camera as the master camera. Each
group can have only one master; pressing the
shutter-release button on the master releases
the shutters on the remote cameras.