Canon EOS-1DX Af Setting Manualbook page 71

Newly developed 61-point AF sensor
By increasing number of AF points greater freedom of
composition is possible. The large number of cross-type
AF points improves tracking performance. And as a
result of two-line AF sensors in a zigzag pattern, tracking
performance is improved for low contrast subjects as
well.
f/2.8 cross-type AF
f/4.0 vertical-line focusing AF
f/5.6 vertical-line focusing AF
f/5.6 horizontal-line focusing AF
71