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

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7
 Custom ControlsN
Even when the <R> switch is set to the right, as long as the depth-
of-field preview button is held down, you can use the camera control 
buttons and dials restricted by [55: Multi function lock] (p.90).
For movie shooting, pressing the button assigned to this function will 
start the movie shooting. To stop the movie shooting, press the button 
again.
Press <0> to play back the images.
Press <0> to magnify or reduce the images recorded on the card 
(p.406). You can also magnify the image during Live View shooting and 
movie shooting (p.325, 329).
Pressing the <B> button changes the settable function in the 
following sequence: m9o9n.
Press <0> to display the flash function setting screen (p.291).
Use this setting when you do not want to assign any function to the 
button.
: Unlock while button pressed
: Start movie recording (when k set)
: Image replay
: Magnify/Reduce (press SET, turn 
)
: Cycle: m/o/n
: Flash function settings
: No function (disabled)