Canon EOS-1D X Mark III Af Setting Manualbook page 101

Set up steps
1
There are two options to customize
the controls to register an AF point
A Assign [Metering and AF start] to the
〈 〉
then press info and select [Registered
AF point]
B Assign [Switch to registered AF point]
〈
to the
button. Press info to select if the
option is applied only when the
button is held or not
2
Manually select AF points you will
want to recall.
(This is possible with all AF area selection modes
except [Zone AF] and [Large Zone AF])
3
Press the
〈 ISO 〉
the
point
〈
* When the
function [Metering and AF start], instant switching of registered AF
button, or the
〈
〉
button,
〈 〉
button while pressing
button to register the AF
〉
button, or the
101 101
〈 〉
button
〉
〈
, or
〈 〉
button is assigned to the
〉