Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 700)

Syncing time between sender and receiver cameras
Sync the time on the sender and receiver cameras as follows.
1.
Follow steps 1–6 in Preparing the sender camera and steps 1–3 in
Preparing receiver cameras.
2.
On the sender camera, select [OK].
Check the number of receiver cameras, then select [ OK ].
After the time is synchronized, the next screen is displayed.
3.
Select [OK] on all of the cameras.
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