Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 115)

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3 Selecting AI Servo AF Characteristics
Once an AF point starts tracking the
subject, this setting enables the camera
to consecutively focus on subjects at
different distances. If a new subject
appears in front of the target subject, the
camera will start focusing on the new
subject. Also effective when you want to
always focus on the closest subject.
Geared for tracking moving subjects
whose speed can change dramatically
and suddenly.
Effective for subjects having sudden
movements, sudden acceleration,
sudden deceleration, or sudden stops.
Case 3: Instantly focus on subjects suddenly entering AF points
Default settings
• Tracking sensitivity: Responsive:
+1
• Accel./decel. tracking: +1
• AF pt auto switching: 0
Case 4: For subjects that accelerate or decelerate quickly
If you want to quickly focus on a subject appearing suddenly, setting
[
Tracking sensitivity ] to [ +2 ] may give better results (p.118).
Default settings
• Tracking sensitivity: 0
• Accel./decel. tracking: +1
• AF pt auto switching: 0
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).