Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 102)

102
Autofocusing with 61 points is possible. All the AF area selection modes
are selectable.
: Dual cross-type AF point. Subject
tracking is superior and the focusing
precision is higher than with other AF
points.
: Cross-type AF point. Subject
tracking is superior and high-
precision focusing is achieved.
: AF points sensitive to horizontal
lines.
Lenses and Usable AF Points
Group A
Although the camera has 61 AF points, the number of usable AF
points, focusing patterns, and Area AF frame configuration vary
depending on the lens. The lenses are thereby classified into
eleven groups from A to K.
When using a lens in groups G to K, fewer AF points will be usable.
See which group each lens belongs to on pages 109-112. Check
which group the lens in use belongs to.
When you press the < S > button, the AF points indicated by the mark
will blink. (The / / AF points will stay lit.) Regarding lighting up or
blinking of the AF points, see page 95.
Regarding new lenses marketed after the EOS-1D X Mark II (in the first
half of 2016), check the Canon Web site to see which group they belong
to.
Some lenses may not be available in certain countries or regions.