Canon EOS-1D X Mark III Af Setting Manualbook page 15

Hints & Tips
First, use [Case 1], which covers
most scenes, and try [Case 2] to
[Case 4] when seeking a more
effective AF setting.
The AF operation may become unstable if the [Tracking
sensitivity] or [Accel./decel. tracking] parameter is set to
an extreme value (+2 or -2). Therefore, as with previous
cameras, it is recommended that to begin with you start
with [Case 1], the standard setting that covers many scenes.
In addition, in cases where AF tracking is difficult with
[Case 1], select [Case 2] to [Case 4] and adjust the
parameters.
If you're unsure which preset to use, or if you want to
shoot even more scenes with one setting, selecting [Case
A] is the most effective.
AF may become
unstable with extreme
parameter settings.
Try using [Case 1] first
for most scenes.
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