Canon EOS Rebel T6i EF-S 18-55mm IS STM Lens Kit 手册

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

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 
focusing point(s). 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.
The AF point(s) achieving focus is displayed as <S>.

All the AF points are used to focus. This mode is set automatically in 
Basic Zone modes (except <x>). 

With One-Shot AF, pressing the shutter button 
halfway will display the AF point(s) <S> that 
achieved focus. If multiple AF points are displayed, 
it means they all have achieved focus.

With AI Servo AF, the manually-selected (p.95) AF 
point <S> is used first to achieve focus. The AF 
point(s) achieving focus is displayed as <S>.

AF Area Selection ModesK

h 

q 

r