Canon EF 500mm f/4L IS II USM User Manual - Page 8
AF Stop Button
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4. AF Stop Button During autofocus operation, you can press the AF stop button to temporarily pause autofocus. If the shutter button is still pressed halfway when the AF stop button is released, autofocusing will continue as before. The AF stop function also works in AI Servo AF mode. Angle positioning of the AF stop button is adjustable by a Canon Service Center at cost. OO With the EOS 630/600, RT, A2/A2E/5, or 10S/10 set to the AI Servo AF mode and continuous shooting, AF will not resume even after you let go of the AF stop button. Press the shutter release button halfway to resume AF. OO With the EOS A2/A2E/5 and 10S/10 set to the Sports mode, AF will not resume even after you let go of the AF stop button. Press the shutter release button halfway to resume AF. OO You can change the functions of the AF stop button using the camera's Custom Function. For details, please refer to the camera's instructions. ENG-7