Canon EOS-1DX MARK II Settings Manual page 93

Group J
AF is possible with 9 points
AF is possible with the center point
AF focusing is possible with 9 points. The following AF
area selection modes are available: Single-point Spot AF,
Single-point AF, Shooting with AF point expansion (up,
down, left, and right), and Auto selection of 9 AF points.
Major lenses + extender combinations — Group J
EF100-400mm F4.5-5.6L IS II USM+
Ext EF1.4x I/II
EF200-400mm F4L IS USM Ext
1.4x+ Ext EF1.4x I/II
EF300mm F4L IS USM+ Ext EF2x I/II
EF400mm F4 DO IS II USM+ Ext EF2x I/II EF400mm F4 DO IS USM+ Ext EF2x I/II
EF400mm F5.6L USM+ Ext EF1.4x I/II
EF500mm F4L IS II USM+ Ext EF2x I/II
EF600mm F4L IS II USM+ Ext EF2x I/II
EF600mm F4L USM+ Ext EF2x I/II
EF70-200mm F4L USM+ Ext EF2x I/II
EF1200mm F5.6L USM+ Ext EF1.4x
"Ext EF1.4x" is an abbreviation of EF 1.4x Extender, and "Ext EF2x"
is an abbreviation of EF2x Extender. Extenders without the type (I, II,
or III) indicated after "1.4x" or "2x" can be used with all I, II, or III
types.
EF100-400mm F4.5-5.6L IS USM+
Ext EF1.4x I/II
EF200-400mm F4L IS USM Ext 1.4x:
using built-in Ext + Ext EF1.4x I/II
EF300mm F4L USM+ Ext EF2x I/II
EF500mm F4.5L USM+ Ext EF1.4x I/II
EF500mm F4L II USM+ Ext EF2x I/II
EF600mm F4L IS USM+ Ext EF2x I/II
EF70-200mm F4L IS USM+ Ext EF2x I/II
EF800mm F5.6L IS EF1.4x+ Ext EF1.4x
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