Canon EOS-1D X Mark III Af Setting Manualbook page 97

During sporting events or concerts, it is common to change
the camera between horizontal and vertical positions. The
EOS-1D X Mark III is equipped with an abundance of AF
points to choose from. This provides a high degree of
freedom when composing shots, however, one downfall
is that when the uppermost left AF point is selected for
shooting while the camera is held in the horizontal position
when the grip is switched to the vertical position, the AF
point ends up in the bottommost lower left of the screen.
If you want to keep the entire body of the athlete in the
frame while focusing on their face, you must choose
another AF point.
In situations like this, AF point settings for each position
are especially useful. By selecting [Separate AF pts: Area+pt]
from [Orientation linked AF point], individual settings for
each of the AF area selection modes and the AF points
can be stored in camera memory. In the previous case, for
example, if you set the center upper edge AF point
beforehand when in the vertical position with the grip at
the top, it is possible to have the AF point line up with the
position of the face instantly when switching from the
horizontal to vertical position. However, during Live View
shooting, only the position of AF points are memorized
even if [Separate AF pts: Area+pt] is selected and set. The
AF area selection mode is not remembered.
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