Canon EOS-1D X Mark III Af Setting Manualbook page 98

How do you quickly switch the AF
point for shooting normally and
vertically?
Allows setting different AF points, but
with the same AF area selection mode
for vertical and horizontal positions.
One more setting of [Orientation linked AF point] is
[Separate AF pts:Pt only]. This lets you set different AF
points but use the same AF area selection mode for vertical
and horizontal positions. Because setting this is simple,
this is an excellent feature for shooting in the vertical and
horizontal positions set in the AF area selection mode.
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