Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 383)

Orientation linked AF point
You can set separate AF points to use in vertical and horizontal shooting, or you can set
both separate AF points and separate AF area selection modes.
[ ] Same for both vert/horiz
The same AF area selection mode and manually selected AF point (or zone) are used in
both vertical and horizontal shooting.
[ ] Separate AF pts: Area+pt
Separate AF area selection modes and AF points (or zones) can be set for each camera
orientation ((1) Horizontal, (2) Vertical with the grip up, (3) Vertical with the grip down).
When you manually select the AF area selection mode and AF point (or zone) for each
of the three camera orientations, they will be registered for the respective orientation.
Whenever you change camera orientations during shooting, the camera switches to the
corresponding AF area selection mode and manually selected AF point (or zone). Note
that in Live View shooting, operation is the same as for [
Separate AF pts: Pt only ].
[ ] Separate AF pts: Pt only
Separate AF point (or zone) positions can be set for each camera orientation ((1)
Horizontal, (2) Vertical with the grip up, (3) Vertical with the grip down). Useful for
switching to AF points (or zones) in other positions automatically based on camera
orientation.
AF points (or zones) you assign to each of the three camera orientations are retained.
Caution
The default setting of [ Same for both vert/horiz ] is restored if, in [ : Reset
camera ], you select [ Basic settings ] in [ Reset individual settings ] ( ). Settings
for orientations (1)–(3) are cleared, and the camera is set to use the center AF
point in 1-point AF.
The setting may be cleared if you switch lenses.
383