Canon EOS-1D X Af Setting Manualbook page 42

EOS-1D X 61-Point High-Density Reticular AF Cross-type Points
f/8
Super telephoto lenses and extenders: AF now possible at f8, at the center AF point
F o r m a n y n a t u r e , w i l d l i f e a n d o t h e r
photographers, it's often necessary to use tele
extenders and focus at effective maximum
apertures slower than f/5.6.
accommodates this, with its ability to focus with
effective maximum apertures as slow as f/8.
Major lenses
EF400mm F4 DO IS USM + Ext 2x
EF500mm F4L IS USM + Ext 2x
EF70-200mm F4L IS USM + Ext 2x
The switchover from f/5.6 (or faster) to f/8 maximum aperture lenses
One interesting aspect of the EOS-1D X's AF system is that the camera instantly communicates
with any lens you attach, once the camera is turned on. Maximum aperture information is
immediately given to the camera and the EOS-1D X then applies this to its AF system — for
instance, during manual AF point selection by displaying only those points that will be available
and advising the shooter of which available AF points won't be cross-type (these blink during
AF point selection). When a lens becomes a Group H lens — by adding an extender to change
its effective maximum aperture to f/8 — only the center AF point becomes available. And if an
off-center AF point was being used previously, the camera switches to the center point. No
special action is required by the photographer, other than mounting the EF Extender.
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AF characteristics with "Group H" lenses — maximum aperture f/8
EF500mm F4L IS II USM
EOS-1D X
Group H
Single cross-type AF point available
The following AF Area selection modes are available:
• Single-point AF (Manual)
• Single-point Spot AF (Manual)
• AF point expansion (four surrounding points)
(four surrounding AF points are single-line, and cannot be manually selected)
EF500mm F4L IS II USM + Ext 2x
EF600mm F4L IS USM + Ext 2x
EF200-400mm F4L IS USM built-in Ext.1.4 + externally-mounted Ext 1.4 EF200-400mm F4L IS USM + externally-mounted Ext 2.0
Extender EF 2x III
Using a compatible f/5.6 lens with an EF1.4x
Extender or an f/4 lens with an EF 2x Extender,
AF is now possible at the center AF point with
cross-type coverage. And, users can set AF
point expansion (4 surrounding points) for an
even larger active AF Area.
f/8 supported cross-type points
f/8 supported points
EF600mm F4L IS II USM + Ext 2x
EF100-400mm F4.5-5.6L IS USM + Ext 1.4