Canon EOS-1DX Af Setting Manualbook page 72

Multi-point cross focusing is possible even
using lenses with a maximum aperture
f-number of f/4
The AF system of the EOS-1D X has many attractive
features such as the high level of composition freedom
with 61 different AF points, AF area selection modes that
utilize the merits of the multi-point AF system, and
implementation of the AF Configuration Tool which takes
advantage of the improved AI Servo AF. In addition to
these, is the high precision and improved tracking
performance of each AF point to capture the subject.
With the EOS-1D X AF focusing system, most f/2.8 - f/4
lenses can utilize the high-performance 41-point cross-
type AF points. As Canon produce a large number of
high performance f/2.8 and f/4 AF points, this makes it
possible for larger aperture lenses to achieve an even
higher level of focusing precision with these AF points
than ever before.
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