Canon EOS 50D - Manual (Page 125)

125
Using AF to FocusN
AF operation
It will take a slightly longer time to focus.
Even when focus has been achieved, pressing the
button
will focus again.
The image brightness may change during and after the AF operation.
If the image flickers, making it difficult to focus, stop and resume the Live
View shooting under the actual light source to be used. Check that the
flickering has stopped, then autofocus.
If you press the button in the Live mode, the AF point area will
be magnified. If it is difficult to focus in the magnified view, return to
the normal view and autofocus. Note that the AF speed may differ
between the normal and magnified views.
If you autofocus in the Live mode’s normal view and then magnify
the image, the focus might be off.
In the Liveu mode, pressing the button will not magnify the
image.
Live Mode and Liveu (Face Detection) Mode Notes
The face-detecting AF point might cover only part of the face.
An object other than a human face might be detected as a face.
Face detection will not work if the face is very small or large in the
picture, too bright or too dark, titled horizontally or diagonally, or partially
hidden.
When you press <9> straight down, it will switch to the Live mode (p.123).
You can tilt the <
> 9 to switch to another AF point. If you press < > 9
straight down again, it will switch back to Liveu (face detection) mode.
Since AF is not possible with a face detected near the edge of the
picture, the
will be grayed out. Then when you press the
button, the center AF point < > will be used to focus.
The AF-assist beam will not be emitted.
Autofocus will not work with the release button on the Remote Switch
RS-80N3 and Timer Remote Controller TC-80N3 (both sold separately).
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