Canon EOS-1D X Af Setting Manualbook page 40

EOS-1D X 61-Point High-Density Reticular AF Cross-type Points
f/4
AF characteristics with "Group C" lenses — f/4 and faster
All 61 AF points available, with cross-type AF at 41 points
In Group C, 41 cross-type AF points can be
used with lenses having an f/4 maximum
aperture (or f/2.8 lenses using the EF 1.4x
Extenders). Of these, the 20 points on the left
and right are noteworthy, with a horizontal line
Major lenses
EF50mm f/2.5 Compact Macro
EF200mm f/2.8L USM + Ext EF1.4x
EF300mm f/2.8L IS USM + Ext EF1.4x
EF400mm f/2.8L II USM + Ext EF1.4x
EF135mm f/2L USM + Ext EF2x
EF8-15mm f/4L Fish eye USM
EF70-200mm f/4L USM
EF70-200mm f/2.8L IS USM + Ext EF1.4x
EF500mm f/4L IS II USM
Group I
31-point cross-type AF points available;
10 are high-precision cross-type, with f/4 lens
AF can be carried out using all 61 points (cross-type focusing is
possible with 31 points). All AF Area selection modes available.
40 40
EF70-200mm f/4L IS USM
Group C
41-point cross-type AF points available
and they can be used with a high level
of tracking performance.
AF possible with all 61 points.
All AF Area selection modes are available.
EF100mm f/2.8L Macro IS USM
EF200mm f/2.8L II USM + Ext EF1.4x
EF300mm f/2.8L IS II USM + Ext EF1.4x
EF400mm f/2.8L IS USM + Ext EF1.4x
EF200mm f/1.8L USM + Ext EF2x
EF17-40mm f/4L USM
EF70-200mm f/4L IS USM
EF70-200mm f/2.8L IS II USM + Ext EF1.4x
EF600mm f/4L IS USM
Major lenses
EF200-400mm F4L IS USM +Ext x1.4 (When not using built-in Ext x1.4)
sensor (reading vertical subject detail) offering
special high-precision performance. All 21
central AF points are cross-type as well, with
standard precision. Some macro lenses with a
maximum aperture of f/2.8 are also included.
EF300mm f/4L IS USM
EF300mm f/2.8L USM + Ext EF1.4x
EF400mm f/2.8L USM + Ext EF1.4x
EF400mm f/2.8L IS II USM + Ext EF1.4x
EF200mm f/2L IS USM + Ext EF2x
EF24-70mm f/4L IS USM
EF70-200mm f/2.8L USM + Ext EF1.4x
EF500mm f/4L IS USM
EF600mm f/4L IS II USM
EF 17-40mm f/4 L USM
EF24-105mm f/4L IS USM