Canon EOS-1D X Mark III Af Setting Manualbook page 105

How do you specify the initial AF
point with Auto selection AF and
+ tracking AF?
This can be done by setting [Initial Servo
AF pt, /
/ ].
[Auto selection AF] and [
AF] can be performed from the AF
point that you set.
Set [Initial AF pt set for
you select an AF point during Auto selection AF, you can
start Auto selection AF from that position. This is effective
when you want to reliably capture and track the target
subject, such as when shooting sports with Auto selection
AF.
], to [Initial AF pt set for
/
If you want to specify the
AF point where AF starts
automatically
selection AF] setting, set
[Initial Servo AF pt,
to [Initial AF pt set for
105 105
+ tracking
] of the [AF4] tab*
in
]. With this setting, if
[Auto
/ ],
/