Canon EOS Rebel T1i EOS REBEL T1i/EOS 500D Instruction Manual - Page 188
C.Fn IV: Operation/Others
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3 Custom Function SettingsN C.Fn IV: Operation/Others C.Fn-10 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 perform 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-11 Assign SET button You can assign a frequently-used function to . When the camera is ready to shoot, you can press . 0: Quick Control screen When you press , the Quick Control screen will appear. Press the key to select the desired function, then turn the dial to set it. 1: Image quality Press to display the image-recording quality setting screen on the LCD monitor. Press the key to select the image-recording quality, then press . 2: Flash exposure compensation When you press , the flash exposure compensation setting screen will appear. 3: LCD monitor On/Off Assigns the same function as the button. 4: Menu display Assigns the same function as the button. 5: Disabled 188