Canon EOS Rebel T1i EOS REBEL T1i/EOS 500D Instruction Manual - Page 46

1 Full Auto Techniques Recomposing the Shot Depending on the scene, position the subject toward the left or right to create a balanced background and good perspective. In the (Full Auto) mode, while you press the shutter button halfway to focus a still subject, the focus will be locked. You can then recompose the shot and press the shutter button completely to take the picture. This is called "focus lock". Focus lock is also possible in other Basic Zone modes (except Sports). Shooting a Moving Subject In the (Full Auto) mode, if the subject moves (distance to camera changes) during or after you focus, AI Servo AF will take effect to focus the subject continuously. As long as you keep aiming the AF point at the subject while pressing the shutter button halfway, the focusing will be continuous. When you want to take the picture, press the shutter button completely. 46