Canon EOS 1DS MARK II 9443A009 Instruction Manual (en)

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C.Fn-17 can be set to expand the AF point’s activation area to include 
the surrounding AF points. (C.Fn-17) (p.152)
Set Custom Functions with 
3
 <
n
>. 
• Expanding the activation area to 7 points
(p.152)
This larger activation area makes it easier to focus subjects moving 
erratically. 
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The expanded AF point activation area 
is not displayed in the viewfinder. 
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When focus is achieved in the One-
Shot AF mode, the selected AF point 
and AF point(s) achieving focus will 
light. 
• Expanding the activation area to 7 or 13 AF points automatically
 (p.152)
As shown below, the AF point activation area expands automatically to 
suit the lens focal length and AF mode. This is effective when the 
subject’s movement is unpredictable. 
AF Point Activation Area
C.Fn-17
C.Fn-17-1
 :Selected AF point
 :AF points in expanded 
activation area
AF
Mode
Lens Focal Length
Shorter than 200mm
200mm or longer
One-
Shot
AF
The AF activation area does not expand 
automatically. 
The activation area expands by 1 AF point
AI
Servo 
AF
C.Fn-17-2