Canon EOS-1DX Instruction Manual page 86

3 Selecting AI Servo AF Characteristics (For a Subject)
Case 1: Versatile multi purpose setting
Default settings
• Tracking sensitivity: [0]
• Accel./decel. tracking: [0]
• AF pt auto switching: [0]
When shooting a subject moving at a steady speed (minimal change in
moving speed), if focus is unstable due to the subject's slight movement or
an obstacle in front of the subject, setting [Accel./decel. tracking] to [-2] or
[-1] may give better results (p.91).
Case 2: Continue to track subjects, ignoring possible obstacles
Default settings
• Tracking sensitivity:
[Locked on: -1]
• Accel./decel. tracking: [0]
• AF pt auto switching: [0]
If an obstacle gets in the way or if the subject moves away from the AF
points for a prolonged period and the focus on the target subject is lost with
the default setting, setting [Tracking sensitivity] to [Locked on: -2] may
give better results (p.90).
86
Standard setting suited for any moving
subject. Works with many subjects and
scenes.
Select [Case 2] to [Case 6] in the
following cases: when obstacles enter
AF points, when the subject tends to
stray from AF points, when you want to
focus a subject that suddenly appears, or
when the subject moves dramatically up,
down, left, or right.
The camera will try to continue focusing
the subject even if an obstacle enters the
AF points or if the subject strays from the
AF points. Effective when there may be
an obstacle blocking the subject or when
you do not want to focus the
background.