Canon EOS-1D 说明手册
70
AF Point Activation Area
C.Fn-17
C.Fn-17 can be set to expand the AF point’s activation area to include more than one active
AF point. (
AF point. (
→p.137)
•
C.Fn-17-1 Expanding the activation area to 7 points
(
→
p.137)
This larger activation area makes it easier to focus subjects moving irregularly.
•
The expanded AF point activation area is not
displayed in the viewfinder.
displayed in the viewfinder.
•
When focus is achieved in the One-Shot AF mode,
the selected AF point and the AF point(s) achieving
focus will light.
the selected AF point and the AF point(s) achieving
focus will light.
C.Fn-17-1
: Selected AF point.
: AF points in expanded
activation area.
•
C.Fn-17-2 Expanding the activation area to 7 or 13 points automatically
(
→
p.137)
As shown below, the AF point activation area expands automatically to 7 or 13 points depend-
ing on the lens focal length, AF mode, and the subject’s speed in the AI Servo AF mode. This
is effective when the subject’s movement is unpredictable.
ing on the lens focal length, AF mode, and the subject’s speed in the AI Servo AF mode. This
is effective when the subject’s movement is unpredictable.
C.Fn-17-2
AF Mode
Lens Focal Length
Shorter than 300mm
300mm or Longer
One-Shot AF
AI Servo AF
The activation area does not expand
automatically.
The activation area expands by one point.
For a slow-moving
subject
For a fast-moving
subject
For a slow-moving
subject
For a fast-moving
subject
a
a
∗
To set the Custom Function, see “Setting a Custom Function” on page 132.