Canon 650D - Manual (Page 297)

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3 Custom Function SettingsN
C.Fn IV: Operation/Others
C.Fn-6 Shutter/AE lock button
0: AF/AE lock
1: AE lock/AF
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.
2: AF/AF lock, no AE lock
In the AI Servo AF operation, you can press the <A> button to stop 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.
3: AE/AF, no AE lock
This is useful for subjects which keep moving and stopping repeatedly.
During AI Servo AF, 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, the optimum focusing and exposure will always be
achieved as you wait for the decisive moment.
During Live View shooting or movie shooting
• With setting 1 or 3, press the <A> button for One-Shot AF.
• With setting 2, press the shutter button halfway for One-Shot AF.
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