Canon EOS 5D MARK IV Instruction Manual page 144

3 Customizing AF FunctionsN
Selectable AF point
You can change the number of manually selectable AF points. With
Zone AF, Large Zone AF, or Automatic selection AF set, AF will be
performed with the selected AF area selection mode (Zone AF, Large
Zone AF, or Automatic selection AF) regardless of the [Selectable AF
point] setting.
With a lens in groups G to K (p.118-121), the number of manually selectable
AF points will be lower.
Even with settings other than [All points], AF point expansion (manual
selection
Zone AF, and Large Zone AF are still possible.
When you press the <S> button, the AF points that are not manually
selectable will not be displayed in the viewfinder.
142
), AF point expansion (manual selection, surrounding points),
: All points
All AF points will be manually
selectable.
: Only cross-type AF points
Only the cross-type AF points will be
manually selectable. The number of
selectable AF points will vary
depending on the lens used.
: 15 points
Fifteen major AF points will be
manually selectable.
: 9 points
Nine major AF points will be manually
selectable.
AF4