Canon EOS-1D X Mark III Af Setting Manualbook page 27

moving" or "suddenly stopping" can occur in various
sports and situations.
In these situations, [Case 4] is most effective. With the
[Accel./decel. tracking] parameter set to [+1], the AI Servo
AF or 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
which is difficult for [Case 1] to track. It is also very effective
for cornering during motor sports (sudden deceleration
and acceleration), and starting sprints.
[Case 4]
Photo
For example, the start of a track and field event. With
[Case 4], the movement of the runner is captured in the
moment from the resting state to sudden acceleration.
By using [Case 4] the AF system reacts to sudden changes
in speed, allowing accurate focusing of the starting
acceleration moment.
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