Canon EOS-1DX Af Setting Manualbook page 49

Overview of AF area selection
modes
Change the AF point selection to match
your the shooting style
AF modes can be selected to match
the subject and conditions
Using only one AF point
Using multiple AF points (zone)
The AF area selection modes make it possible to set how
many of the 61-point AF are available to be used. Set
the selection method of AF points that best matches the
subject and shooting conditions.
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