Canon DS126251 Manual Do Utilizador

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AF Area Selection Modes

The 19 AF points are divided into five zones for focusing. All the AF 
points in the selected zone are used for the automatic selection of the 
AF point. It makes achieving focus easier than with single-point AF or 
AF point expansion and it is effective for moving subjects. However, 
since it is inclined to focus the nearest subject, focusing a specific target 
is harder than with single-point AF or AF point expansion.
With One-Shot AF, the AF point <S> which achieved focus will be 
displayed.

All the AF points are used to focus. Automatically set in fully-automatic 
modes (1/C).

With One-Shot AF, pressing the shutter button 
halfway will display the AF point(s) <S> which 
achieved focus. If multiple AF points are displayed, 
it means they all have achieved focus. This mode 
tends to focus the nearest subject.
With AI Servo AF, the manually-selected (p.88) AF 
point <S> is used first to achieve focus. This 
cannot be set in fully-automatic modes (1/C).

With 19-point AF and Zone AF, the active AF point will keep switching to 
track the subject in AI Servo AF mode. However, under certain shooting 
conditions (such as when the subject is small), it might not be able to track 
the subject. Also, in low temperatures, the tracking response is slower.

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