Canon EOS-1DX Af Setting Manualbook page 24

stopping can occur in various sports and situations and it
can be difficult for the AF system to judge accurately, In
these situations, Case 4 is most effective. With the
[Accelerate / decelerate Tracking] parameter set to [+1],
the AI Servo AF will work to focus track any changes in
speed, including sudden stops and acceleration. This
makes Case 4 the most effective setting for shooting
soccer, rugby, basketball or sports where there is a lot of
running and stopping, as well as changes of direction. It
is also effective for cornering during motor sports
(sudden deceleration and acceleration).
Case 4
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For example in soccer. A player dribbling at high speed
stops suddenly in front of a defender, changes direction
and then begins to sprint again. By using Case 4 the AF
system reacts to sudden changes in speed, allowing
continuous and accurate focusing.
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