Canon EOS 1 V HS - Manual (Page 36)

AF Mode Selection
Al Servo AF for Moving Subjects
While you press the shutter
button halfway, the camera
focuses continuously.
• This AF mode suits moving subjects
when the focusing distance keeps
changing.
• With predictive AF*, the camera can
also focus track a subject which
steadily approaches or retreats from
the camera.
• The exposure settings are set
immediately before the picture is
taken.
• When focus is achieved in the Al Servo AF mode, the viewfinder's in-focus
indicator does not light and the beeper does not sound.
• If the viewfinder's in-focus indicator blinks, focus cannot be achieved.
• The focus cannot be locked (except when Custom Function C.Fn-4 is set to 2.)
* 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. This is for obtaining correct focus
at the moment of exposure.
With a manually selected focusing point, the focusing point will flash in red
and focus track the subject.
When the focusing point selection is automatic, 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 in the Area AF ellipse. The active
focusing point does not light.
fSigSi With Custom Function C.Fn-4-2, you can lock the focus momentarily by
pressing the <^> button even while the Al Servo AF is active. (->p.100)
Malil Custom Function C.Fn-11-2 enables you turn the <0> dial to change the
focusing point to track the subject in the Al Servo AF mode, (-^p.105)
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