Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 117)

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3 Selecting AI Servo AF Characteristics
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.119).
If the subject moves even more dramatically up, down, left, or right,
setting [
AF pt auto switching ] to [ +2 ] may give better results (p.120).