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Canon® EOS Rebel XSi/450D Guide to Digital SLR Photography by David D. Busch

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Using Autofocus with Live View

You can temporarily interrupt Live View mode to allow the Rebel XSi to use autofocus. Because the step takes a few seconds, you’re better off using autofocus when the camera is mounted on a tripod. If you handhold the XSi, you may displace the point of focus achieved by the autofocus system. Canon also recommends that you use One Shot focus and center the focus point. You can use AI Servo and automatic or manual focus point selection, but if the focus point doesn’t coincide with the subject you want to focus on, you’ll end up with an out-of-focus image.

There are two different autofocus methods possible with Live View: Quick Mode, and Live Mode. To choose the mode you want, access C. Fn. III-08 AF During Live View ...

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