Canon EOS-1D X Af Setting Manualbook page 23

for erratic, stop-and-start movement
moving at consistent speeds
[Accel./decel. tracking] is significant: it allows AI
Servo AF to be optimized for steady, continuous
movement or for more erratic, inconsistent subject
speeds. The default setting is [0], which is best for
shooting subjects who move at steady speeds or are
not likely to experience significant changes in speeds.
[+1/+2] are best for shooting subjects who
suddenly start or stop moving, or tend to accelerate
or decelerate. This setting enables the camera to
continue focusing on the desired subject even when
it experiences significant, split second changes in
[Accel./decel tracking] option [-1/2] are new parameters for shooting in situations
where far away subjects experience minor changes in speed and obstructions may
pass by near the subject. Specifically, this setting is effective for sports with wide
playing fields, such as soccer, when you want to capture distant action. In many cases
when photographing such a scene, another athlete — near the main subject — can
momentarily move in front of your subject, potentially throwing off AF by a small
amount. The new [-1] and especially [-2] settings recognize these sudden but minor
changes as unintentional and continue smooth focus-tracking on the original subject.
Both new settings also provide more stable AF on continuously moving subjects, even
with no distant obstructions. They're also ideal for subjects who move only slightly.
speed. For example, the camera becomes less likely to
focus behind an approaching subject who moves
suddenly and less likely to focus in front of a subject
when it stops suddenly, which would result in a
blurred subject. [+2] can handle greater changes in
speed than [+1].
The new [-1/-2] offers even more focus stability
when shooting steadily moving subjects. In particular,
they are ideal for resisting minor but sudden changes
in what the focus points "see," if an obstruction
occurs near the subject (see below).
Blue color of focus point is for illustration.
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