Canon EOS-1DX Instruction Manual page 102

3 Customizing AF Functions
: Separate AF pts: Area+pt
The AF area selection mode and manually-selected AF point (or Zone)
can be set separately for each camera orientation (1. Horizontal, 2.
Vertical with the camera grip at the top, 3. Vertical with the camera grip
at the bottom).
When you manually select the AF area selection mode and AF point (or
zone) for each of the three camera orientations, they will be recorded for
the respective orientation. Whenever you change the camera orientation
during shooting, the camera will switch to the AF area selection mode
and manually-selected AF point (or zone) set for that orientation.
: Separate AF pts: pt only
The AF point can be set separately for each camera orientation (1.
Horizontal, 2. Vertical with the camera grip at the top, 3. Vertical with the
camera grip at the bottom). While using the same AF area selection
mode, the AF point will switch automatically for the respective camera
orientation.
This works with Manual select.:Spot AF, Manual selection:1 pt AF,
Expand AF area:
When you manually select the AF point for each of the three camera
orientations, it will be recorded for the respective orientation. During
shooting, the manually-selected AF point will switch to match the
respective camera orientation. Even if you change the AF area
selection mode to Manual select.:Spot AF, Manual selection:1 pt AF,
Expand AF area:
the respective orientation will be retained.
If you change the AF area selection mode to Zone AF (manual selection
of zone), the zone will switch to match the respective camera
orientation.
If you clear the camera settings to their defaults (p.58), the setting will be
[Same for both vert/horiz]. Also, your settings for the three camera
orientations will be cleared and all settings will revert to Single-point AF
(manual selection) with the center AF point selected.
If you set this and later attach a lens from a different AF group (p.77-84,
especially Group H), the setting may be cleared.
102
, and Expand AF area:Surround.
, or Expand AF area:Surround, the AF point set for