Canon EOS 600D Instruction Manual page 158

3 Menu Function Settings
kShutter/AE lock button
You can change the function assigned to the shutter button's halfway
position and to the AE lock button.
• AF/AE lock:
Normal function. Press the shutter button halfway to execute AF.
Press the <w> button for AE lock.
• AE lock/AF:
Press the shutter button halfway for AE lock. For AF, press the
<w> button. Convenient when you want to focus and meter at
different parts of the picture.
• AF/AF lock, no AE lock:
Press the shutter button halfway to execute AF. While holding
down the <w> button, press the shutter button to take a still photo
without executing AF. Convenient when you do not want to
autofocus when taking a still photo during movie shooting. AE lock
is not possible.
• AE/AF, no AE lock:
Press the shutter button halfway for metering. For AF, press the
<w> button. AE lock is not possible.
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