Canon EOS-1Dx Manual Book page 12

AF Configuration Tool [Parameters]
[-1/-2] is effective for subjects with minor speed
New!
Firmware
A minus setting for subjects with a long shooting distance such as soccer
[-2] [0]
Examples where the [-] setting is more effective
Sports with far-away subjects that experience relatively minor changes in
speed, and obstructions that often pass in front of the subject
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Accelerate / decelerate Tracking characteristics
C h o o s e a n y o f
[Case] and push
button for, Accel./
decel.tracking,then
a d j u s t l e v e l b y
p r e s s i n g
turning .
changes
provides more stable focus
[Accel./decel. tracking] is a tracking setting for
subjects that experience changes in speed and move
or stop suddenly. The default setting is [0], which is
best for shooting subjects that move at steady
speeds, or do not experience significant changes in
speeds.
[+1/+2] are best for shooting subjects that suddenly
start or stop moving, or suddenly accelerate or
decelerate. This setting enables the camera to
continue focusing on the desired subject even when
a n d
it experiences significant, split-second changes in
[Accel./decel tracking] option [-1/2] is a new parameter for shooting in situations
where far-away subjects experience minor changes in speed, and many obstructions
pass by in the foreground. Specifically, this setting is effective for sports with wide
playing fields, such as soccer, when you want to capture action on the far side of the
field. In many cases when photographing such a scene, another athlete moves across
the foreground when the subject you are aiming for is experiencing relatively minor
changes in speed (the relative speed changes become more significant when the
shooting distance is closer). In such a situation, [-1/2] is more effective than a setting
of [0] for foreground obstructions.
speed. For example, the camera becomes less likely to
focus behind an approaching subject that 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 newly-added [-1/-2] are effective for shooting far
away subjects with small changes in speed when you
want to focus on minimizing the effects of
obstructions passing by in the foreground of the shot.
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Blue color of focus point is for illustration.