Canon EOS 5D Mark IV L-series Zoom Lens Kit オーナーマニュアル

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 Selecting AI Servo AF CharacteristicsN
Geared for tracking moving subjects 
whose speed can change dramatically 
and suddenly. Also, if the target subject 
moves dramatically up, down, left or right 
and it is difficult to focus, the AF point 
switches automatically to track the 
subject.
It is recommended to use this setting 
with the following modes; AF point 
expansion (manual selection
), AF 
point expansion (manual selection, 
surrounding points), Zone AF, Large 
Zone AF, and Automatic selection AF.
With Single-point Spot AF or Single-point 
AF mode, the tracking action will be the 
same as with Case 4.
Case 6: For subjects that change speed and move erratically
Default settings
• Tracking sensitivity: 0
• Accel./decel. tracking: +1
• AF pt auto switching: +1
 
If the subject is in motion, and prone to sudden, dramatic changes in 
speed, setting [Accel./decel. tracking] to [+2] may give better results 
(p.133).
 
If the subject moves even more dramatically up, down, left, or right, 
setting [AF pt auto switching] to [+2] may give better results (p.134).