Canon 9128B016 Benutzerhandbuch

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For pinpoint focusing over a narrower area than 
with single-point AF (manual selection). Select one 
AF point <

> to focus.

Effective for pinpoint focusing or focusing 
overlapping subjects such as an animal in a cage.
Since Single-point Spot AF (manual selection) 
covers a very small area, focusing may be difficult 
during hand-held shooting or for a moving subject.

Select one AF point <S> to be used for focusing.

The manually-selected AF point <S> and adjacent AF points <w> 
(above, below, on the left and on the right) are used to focus. Effective 
when it is difficult to track a moving subject with just one AF point.
With AI Servo AF, the initial manually-selected AF point <S> must 
focus-track the subject first. However, it is superior to Zone AF in 
focusing on the target subject.
With One-Shot AF, when focus is achieved with expanded AF points, 
the expanded AF points <S> will also be displayed along with the 
manually-selected AF point <S>.

AF Area Selection ModesN