Canon EOS-1DX Af Setting Manualbook page 102

Set up steps
1
There are two options to customize
the controls to register and AF point
A Assign [Metering - AF start] to the
button, or the
select [Registered AF point]
B Assign [Switch to registered AF point] to
the button,
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)
3
Press the
the
When the
function [Metering - AF start], instant switching of
registered AF points becomes possible. Press the
button in the [Customize Controls] assignment screen,
and then select [Registered AF point]. Now when the
button is held the AF will use the registered AF pointed.
button then press info and
, or
button while pressing
button until you hear a beep.
button, or the
102
button. Press info
button are assigned the