Canon EOS Rebel T3i EOS REBEL T3i / EOS 600D Instruction Manual - Page 158
Shutter/AE lock button
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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 button for AE lock. • AE lock/AF: Press the shutter button halfway for AE lock. For AF, press the 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 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 button. AE lock is not possible. 158