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

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 Selecting AI Servo AF CharacteristicsN
134
 
AF point auto switching
This sets the switching sensitivity of the 
AF points as they track the subject 
moving dramatically up, down, left, or 
right.
This setting takes effect when the AF 
area selection mode is set to AF point 
expansion (manual selection
), AF 
point expansion (manual selection, 
surrounding points), Zone AF, Large 
Zone AF, or Automatic selection AF.
0
Standard setting for gradual AF point switching.
+2 / +1
Even if the target subject moves dramatically up, down, left, or right 
and moves away from the AF point, the camera switches its focus to 
neighboring AF points to continue focusing on the subject. The 
camera switches to the AF point deemed most likely to focus on the 
subject based on the subject’s continual movement, contrast, etc. 
Setting +2 makes the camera more prone to switch the AF point than 
with +1.
However, with a wide-angle lens having a wide depth of field or if the 
subject is too small in the frame, the camera may focus with an 
unintended AF point.