Canon 1D X - Manual (Page 76)

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Autofocusing with 61 points is possible. All of the AF area selection
modes are selectable.
: Dual cross-type AF point. Subject
tracking is superior and the focusing
precision is higher than with other AF
points.
: Cross-type AF point. Subject
tracking is superior and high-
precision focusing is achieved.
: AF points sensitive to horizontal
lines.
Lenses and Usable AF Points
Group A
Although the camera has 61 AF points, the number of usable AF
points and focusing patterns will differ depending on the lens. The
lenses are thereby classified into eight groups from A to H. Check
which group your lens belongs to.
When using a lens from groups F to H, fewer AF points will be usable.
When you press the <S> button, the AF points indicated by the mark
will blink. (The / / AF points will stay lit.)
“Extender EF1.4x” and “Extender EF2x” apply to all the I/II/III models.
Regarding new lenses marketed after the EOS-1D X, check Canon’s
Web site to see which group they belong to.
Some lenses may not be available in certain countries or regions.
EF24mm f/1.4L USM EF50mm f/1.8 II
EF200mm f/1.8L USM
+ Extender EF1.4x
EF24mm f/1.4L II USM EF85mm f/1.2L USM EF200mm f/2L IS USM
EF28mm f/1.8 USM EF85mm f/1.2L II USM
EF200mm f/2L IS USM
+ Extender EF1.4x
EF35mm f/1.4L USM EF85mm f/1.8 USM EF200mm f/2.8L USM
EF35mm f/2 EF100mm f/2 USM EF200mm f/2.8L II USM
EF50mm f/1.0L USM EF135mm f/2L USM EF300mm f/2.8L USM
EF50mm f/1.2L USM
EF135mm f/2L USM
+ Extender EF1.4x
EF300mm f/2.8L IS USM
EF50mm f/1.4 USM EF135mm f/2.8 (Softfocus) EF300mm f/2.8L IS II USM
EF50mm f/1.8 EF200mm f/1.8L USM EF400mm f/2.8L USM
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