Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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Connecting to an NFC-enabled Smartphone
If necessary, also read “NFC Function Cautions” (p.25).
When touching the smartphone to the camera, be careful not to drop the 
camera or smartphone.
Do not touch the smartphone to the camera with too much force. Doing 
so can scratch the camera or smartphone.
Just holding the smartphone close to the mark may not establish a 
connection. Be sure to touch the mark with the smartphone so that they 
come into contact with each other.
Recognition may be difficult depending on the smartphone. Touch slowly 
while changing the position or rotating horizontally.
Another application on the smartphone may start depending on how you 
touch. Check the position of the P mark, then touch again.
When touching the smartphone to the camera, do not leave anything 
between the camera and smartphone. In addition, when a case is 
attached to the camera or smartphone, communication may not be 
possible via NFC function.
The camera cannot be connected to two or more smartphones at the 
same time.
By default, the connection settings with the NFC function are saved as 
the fourth setting (a setting dedicated to NFC connection) under the 
name [SET4(NFC)]. When you connect the camera to another 
smartphone via NFC, [SET4(NFC)] will be overwritten.
While connected, the camera’s auto power off does not function.