Canon REBEL T3I EOS 600D User Manual page 86

S Selecting the AF Point N
Shooting Tips
When shooting a portrait up close, use One-Shot AF and focus
the eyes.
If you focus the eyes first, you can then recompose and the face will
remain sharp.
If it is difficult to focus, select and use the center AF point.
The center AF point is the most sensitive among the nine AF points.
To make it easier to focus a moving subject, set the camera to
automatic AF point selection and AI Servo AF (p.84).
The center AF point will first be used to focus the subject. During
autofocusing, if the subject moves away from the center AF point,
focus tracking continues as long as the subject is covered by
another AF point.
AF-Assist Beam with the Built-in Flash
Under low-light conditions, when you press the shutter button halfway,
the built-in flash fires a brief burst of flashes. It illuminates the subject to
enable easier autofocusing.
The AF-assist beam will not be fired in the following shooting modes:
<7>, <3> and <5>.
The AF-assist beam cannot be emitted in the AI Servo AF mode.
The effective range of the AF-assist beam emitted by the built-in flash is
about 4 meters/13.1 feet.
In Creative Zone modes when you raise the built-in flash with the <I>
button (p.90), the AF-assist beam will be fired when necessary.
If you use an Extender (sold separately) and the maximum aperture
becomes smaller than f/5.6, AF shooting will not be possible (except in [Live
mode] and [u Live mode] during Live View shooting). For details, see the
Extender's instruction manual.
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