Canon EOS-1DX Af Setting Manualbook page 106

Instantly switching AF area
selection modes
By assigning an [AF area selection
mode] to a specific button in the
[Custom Control] screen, you can
continue shooting and switch AF areas
instantly with the press of single button
without having to move your eye from
the viewfinder.
Instantly switching AF area selection
modes with a single button
Assigning functions
On shooting with
optional 'AF area
selection mode'
By pressing the
assigned button
Switchable into set 'AF
area selection mode'
106