Canon EOS Rebel T6s EF-S 18-135mm IS STM Lens Kit 手册

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 Custom Function SettingsK

This is convenient when you want to focus and meter separately. 
Press the <A> button to autofocus, and press the shutter button 
halfway to apply AE lock.

During AI Servo AF (or Servo AF for Live View shooting), you can 
press the <A> button to pause the AF operation momentarily. 
This prevents the AF from being thrown off by any obstacle 
passing between the camera and subject. The exposure is set at 
the moment the picture is taken.

This is useful for subjects that keep moving and stopping 
repeatedly. During AI Servo AF (or Servo AF for Live View 
shooting), you can press the <A> button to start or stop the AI 
Servo AF operation. The exposure is set at the moment the picture 
is taken. Thus, you can set your camera, so that the optimum 
focusing and exposure can be achieved and wait for the decisive 
moment.

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When touch shutter is set and with setting 1 or 3, AF will not take effect 
for shooting.

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With setting 1 or 3, press the <A> button for One-Shot AF.

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With setting 2, press the shutter button halfway for One-Shot AF.