Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - 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