Canon EOS-1D X Af Setting Manualbook page 41

f/5.6
EF100-400mm f/4.5-5.6L IS USM
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 higher ("slower")
are included in Group E and can use the
Major lenses
EF50mm f/2.5 compact macro + life size converter EF
EF400mm f/5.6L USM
EF300mm f/4L IS USM + Ext EF1.4x
EF600mm f/4L USM + Ext EF1.4x
EF200mm f/2.8L II USM + Ext EF2x
EF300mm f/2.8L IS II USM + Ext EF2x
EF400mm f/2.8L IS USM + Ext EF2x
EF600mm f/4L IS II USM + Ext EF1.4x
EF70-200mm f/2.8L IS II USM + Ext EF2x
EF28-300mm f/3.5-5.6L IS USM
EF70-300mm f/4.5-5.6 DO IS USM
Group F
21-points cross-type available, total of 47 AF
points available to select
AF focusing is possible with 47 points (61-point AF is not possible).
All AF Area selection modes can are available.
AF characteristics with "Group E" lenses — f/5.6 and faster
Group E
The central 21-point cross-type
AF can be used
AF possible with all 61 points. Standard-precision,
cross-type AF at 21 central AF points. All AF
Area selection modes are available.
EF500mm f/4.5L USM
EF400mm f/4 DO IS USM + Ext EF1.4x
EF600mm f/4L IS USM + Ext EF1.4x
EF300mm f/2.8L USM + Ext EF2x
EF400mm f/2.8L USM + Ext EF2x
EF400mm f/2.8L IS II USM + Ext EF2x
EF70-200mm f/2.8L USM + Ext EF2x
EF70-200mm f/4L USM + Ext EF1.4x
EF70-300mm f/4-5.6 IS USM
EF100-400mm f/4.5-5.6L IS USM
*1 When using built-in Ext EF x1.4 or externally-mounted Ext EF x1.4
Major lenses
EF800mm f/5.6L IS USM
EF35-350mm f/3.5-5.6L
USM
EF70-300mm f/4-5.6L IS USM
21-point cross-type AF (f/5.6, standard-precision
cross-type) in the central area. Many f/2.8 wide-
aperture telephoto lenses, combined with any
EF 2x Extender, will fit into this group.
EF100mm f/2.8 Macro USM
EF300mm f/4L USM + Ext EF1.4x
EF500mm f/4L IS USM + Ext EF1.4x
EF200mm f/2.8L USM + Ext EF2x
EF300mm f/2.8L IS USM + Ext EF2x
EF400mm f/2.8L II USM + Ext EF2x
EF500mm f/4L IS II USM + Ext EF1.4x
EF70-200mm f/2.8L IS USM + Ext EF2x
EF70-200mm f/4L IS USM + Ext EF1.4x
EF70-300mm f/4-5.6L IS USM
EF200-400mm f/4L IS USM +Ext EF ×1.4 (*1 ）
Group G
15-points cross-type available, total of 33 AF
points available to select
AF focusing is possible with 33 points (61-point AF is not possible).
All AF Area selection modes can are available.
"Ext EF1.4x" an abbreviation of various EF1.4x Extenders
Lenses
EF180mm f/3.5L Macro
USM
EF180mm f/3.5L Macro
USM + Ext EF1.4x
EF1200mm f/5.6L USM
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