Canon EOS 5D Mark III Manual Book page 8

AF Configuration Tool [Presets]
Focus track subjects that can accelerate or decelerate quickly
Effective when a subject's speed changes rapidly, or in sports where subjects
stop or change direction
Parameter default settings
Subject tracking sensitivity [0]
Accelerate / decelerate Tracking [+1]
AF point auto switching [0]
Continuously track players as they suddenly slow down and speed up
W h e n s h o o t i n g s p o r t s , t h e r e a r e m a n y
situations where it will be necessary to deal
with fast moving subjects. Subjects suddenly
going from static to moving or sudden stopping
can occur in various sports and situations and it
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Case4
For example in soccer.
A player dribbling at
h i g h s p e e d s t o p s
suddenly in front of
a defender, changes
direc tion and then
b e g i n s t o s p r i n t
again. By using Case
4 the AF system reacts
to sudden changes
in speed, allowing
c o n t i n u o u s a n d
accurate focusing.
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).
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