Canon EOS 7 - Manual (Page 44)

Selecting the AF Mode
• About Predictive AF
If the subject approaches or retreats from the camera at a constant rate,
the camera tracks the subject and predicts the focusing distance
immediately before the picture is taken. It thus predicts the distance where
the subject will be at the moment of exposure. This is for obtaining a more
accurate focus.
• In the automatic focusing point selection mode (-»page 45), the camera
first uses the center focusing point to focus. If the subject later moves
away from the center focusing point, focus tracking continues as long as
the subject is covered by another focusing point. The active focusing
point does not flash.
• In the manual focusing point selection mode (-»page 45), the focusing
point that flashes in red is used for predictive AF.
[OJn With C.Fn-4-2, you can lock the focus momentarily by pressing the <*-c.Fn>
button even while Al Servo AF is in effect, (-»page 88)
Al Focus AF for Still and Moving Subjects
The AF mode changes
automatically to suit the subject.
► If the subject focused in the One-
Shot AF mode starts to move, the
camera detects the subject
movement and switches
automatically to Al Servo AF to
continue tracking the subject.
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