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

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 Custom ControlsN
502
Only while you hold down the depth-of-field preview button or the lens’s 
AF stop button, you can apply AF with the following settings: AF area 
selection mode (p.104), Tracking sensitivity (p.132), Acceleration/
deceleration tracking (p.133), AF point auto switching (p.134), AI Servo 
1st image priority (p.136), and AI Servo 2nd image priority (p.137)
Useful when you want to change the AF characteristics during AI Servo 
AF.
*2: On the setting screen, press the <B> button to 
display the detailed settings screen. Turn the 
<5> or <6> dial to select the function to be 
registered, then press <0> to add a checkmark 
[X]. When you select a function and press <0>, 
you can adjust the setting. By pressing the <L> 
button, you can revert the settings to their defaults.
You can switch the AF operation. In One-Shot AF mode, when you 
press the button to which this function is assigned, the camera switches 
to AI Servo AF/Servo AF mode. If you press the button in the AI Servo 
AF/Servo AF mode, the camera switches to One-Shot AF mode. Useful 
when you need to keep switching between One-Shot AF and AI Servo 
AF/Servo AF for a subject that keeps moving and stopping.
*3: On the setting screen, when you press the <B> button, you can select [Switch 
only when btn is held] or [Switch each time btn is pressed].
: Switch to registered AF function
: ONE SHOT z AI SERVO/SERVO
This function does not work during Live View shooting if Multi Shot Noise 
Reduction is set.