Canon 2757B001 EOS DIGITAL REBEL XSi/EOS 450D Instruction Manual - Page 88
AAE Lock
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A AE LockN Use AE lock when the area of focus is to be different from the exposure metering area or when you want to take multiple shots at the same exposure setting. Press the button to lock the exposure, then recompose and take the shot. This is called AE lock. It is effective for backlit subjects. 1 Focus, then press the button. (0) Press the shutter button halfway. X The exposure setting will be displayed. X The icon lights in the viewfinder to indicate that the exposure setting is locked (AE lock). Each time you press the button, it locks the current exposure setting. 2 Recompose and take the picture. AE Lock Effects Metering Mode (p.77) AF Point Selection Method Automatic Selection Manual Selection q* AE lock is applied at the AF AE lock is applied at the point that achieved focus. selected AF point. wre AE lock is applied at the center AF point. * When the lens' focus mode switch is set to , AE lock is applied at the center AF point. 88