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

61-point AF (3)

The number and placement of

cross-type points used by the

f/5.6 lenses
Majority of lenses can make use of the central
21-point cross-type AF
With the exception of a small group of lenses (groups F
and G), almost all lenses that have a maximum aperture
of f/4 or greater are included in Group E, and can use
the 21-point cross-type AF (f/5.6 cross-type) in the
central area. Many f/2.8 maximum aperture large
aperture telephoto lenses when used with the various EF
2x Extenders will fit into this group.
EF100-400mm f/4.5-5.6L IS USM
EF70-300mm f/4-5.6L IS USM
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