Servo af, Moving subjects, About predictive af – Canon EOS 3 User Manual

Page 36

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AF Mode Selection

Servo AF

for

Moving

Subjects

While you press the shutter button

halfway,

the

camera

focuses

continuously.

This

mode

suits

moving subjects. With predictive AF,

the camera can also focus track a

subject which steadily approaches or

retreats

from

the

camera.

The

exposure setting are set immediately
before the picture is taken.

In the Al Servo AF mode, the viewfinder’s in-focus indicator does not light and the

beeper does not sound even when focus is achieved.

If the viewfinder’s in-focus indicator blinks, focus cannot be achieved.

The focus cannot be locked (except when Custom Function CF-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.

When 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.

With Custom Function CF-4, you can lock the focus momentarily by pressing the
<*> button even while the Al Servo AF is active. See page 108.

Custom Function CF-11 enables you turn the <0> dial to change the focusing
point to track the subject in the Al Servo AF mode. See page 116.