Canon EOS-1D X Af Setting Manualbook page 39

tracking performance
sensors for superb focus acquisition and accuracy
f/2.8
41 cross-type AF points (5 diagonal, extra-high precision) can be used with many lenses
Most wide-aperture lenses with a maximum
aperture of f/2.8 (or "faster") are in Group A.
With these lenses, five extra high-precision
diagonal and twenty outer high-precision cross-
type AF points are available — a total of 41
Major lenses
EF24mm f/1.4L USM
EF35mm f/2
EF50mm f/1.8 II
EF135mm f/2L USM
EF200mm f/1.8L USM
EF200mm f/2.8L USM
EF400mm f/2.8L USM
TS-E90mm f/2.8*
EF28-70mm f/2.8L USM
Group B
41-point cross-type AF, with one high-precision,
diagonal dual-cross AF point at the center
AF is possible with all 61 points. Extra high-precision, diagonal cross-
type AF at center point; high-precision at 20 outer AF points
(shown in blue, above). All AF Area selection modes are available.
* Focus confirmation light works during manual focus (without any tilt or shift movements).
"Ext EF1.4x" is an abbreviation of various EF 1.4x Extenders.
AF characteristics with "Group A" lenses — f/2.8 & faster
EF400mm F2.8L IS II USM
Group A
41-point cross-type AF, with five f/2.8
dual-cross AF points at the center
AF is possible with all 61 point s. Ex tra high-
precision, diagonal cross-type AF at five central AF
points. All AF Area selection modes can be chosen.
EF24mm f/1.4L II USM EF35mm f/2 IS USM
EF50mm f/1.0L USM EF50mm f/1.2L USM
EF85mm f/1.2L USM EF85mm f/1.2L II USM
EF135mm f/2L USM + Ext EF1.4x
EF200mm f/1.8L USM + Ext EF1.4x EF200mm f/2L IS USM
EF200mm f/2.8L II USM EF300mm f/2.8L USM
EF400mm f/2.8L II USM EF400mm f/2.8L IS USM
EF16-35mm f/2.8L USM EF16-35mm f/2.8L II USM
EF24-70mm f/2.8L II USM EF70-200mm f/2.8L USM
Major lenses
EF14mm f/2.8L II USM
EF20mm f/2.8 USM
EF24mm f/2.8
EF24mm f/2.8 IS USM
EF28mm f/2.8 IS USM
EF24-70mm f/2.8L USM
EF85mm F1.2L II USM
cross-type points — including the remaining
standard-precision cross-type points in the
central area. For technical reasons, with Group
B lenses, one high-precision, diagonal cross-
type point (instead of five) becomes available.
f/2.8 (high-precision, diagonal) and
f/5.6 cross-type AF (dual-cross AF)
f/5.6 cross-type AF
f/4 (vertical-line focusing) + f/5.6
(horizontal-line focusing) cross-type AF
f/5.6 (horizontal-line focusing) AF
EF28mm f/1.8 USM
EF50mm f/1.4 USM
EF85mm f/1.8 USM
EF135mm f//2.8 (with soft focus)
EF200mm f/2L IS USM + Ext EF1.4x
EF300mm f/2.8L IS USM
EF400mm f/2.8L IS II USM
EF17-35mm f/2.8L USM
EF70-200mm f/2.8L IS USM EF70-200mm f/2.8L IS II USM
Group D
31-point cross-type AF, with one high-precision,
diagonal dual-cross AF point at the center
AF focusing is possible with all 61 points. Extra high-precision, cross-
type AF at center point; high-precision at 10 outer AF points (shown
in blue, above). All AF Area selection modes are available.
EF35mm f/1.4L USM
EF50mm f/1.8
EF100mm f/2 USM
EF300mm f/2.8L IS II USM
TS-E45mm f/2.8*
EF20-35mm f/2.8L
Lenses
EF28mmf/2.8
EF28mm f/2.8
EF40mmf/2.8STM
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