61-Point Af; The Number And Placement Of Cross-Type Points Used By The - Canon EOS-1DX Af Setting Manualbook

61-point AF (2)

The number and placement of
cross-type points used by the f/4
lenses
41-point cross-type AF points can be used
In Group C, 41-point cross-type AF points can be used
with lenses having an f/4 maximum aperture (or f/2.8
maximum aperture lenses using the EF 1.4x Extenders).
Of these, the 20 points on the left and right are f/4 and
f/5.6 cross-type AF providing even higher precision focus
in these areas than with previous cameras. Some macro
lenses with a maximum aperture of f/2.8 are also
included.
EF70-200mm f/4L IS USM
EF 17-40mm f/4 L USM
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