Canon EOS Rebel T3i Body EOS REBEL T3i / EOS 600D Instruction Manual - Page 256
C.Fn IV: Operation/Others
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3 Custom Function SettingsN C.Fn IV: Operation/Others C.Fn-9 Shutter/AE lock button 0: AF/AE lock 1: AE lock/AF Convenient when you want to focus and meter separately. Press the 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 mode, you can press the 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. In the AI Servo AF mode, you can press the 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. C.Fn-10 Assign SET button You can assign a frequently-used function to . Press when the camera is ready to shoot. 0: Normal (disabled) 1: Image quality Press to display the image-recording quality setting screen on the LCD monitor. Select the desired image-recording quality, then press . 2: Flash exposure compensation When you press , the flash exposure compensation setting screen will appear. Set the flash exposure compensation, then press . 3: LCD monitor On/Off Assigns the same function as the button. 4: Menu display Press to display the menu screen. 5: ISO speed The ISO speed setting screen will appear. Press the key or turn the dial to change the ISO speed. You can also refer to the viewfinder to set the ISO speed. 256