Canon EOS 1D X Mark II - Manual (Page 67)

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6
Synchronizing the
Camera Time
You can set the master camera time on up to 10 slave
cameras. Note that even after synchronization, there
will be a slight margin of error between master and
slave camera time of ±0.05 seconds, at most.
Slave camera
LAN cable
LAN cable
Slave camera
Master camera
Hub
Master camera