Canon EF 400mm f2.8L IS II USM - Manual (Page 8)

ENG-7
4. AF Stop Button
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.
With the EOS 630/600, RT, A2/A2E/5, or 10S/10 O O
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.
With the EOS A2/A2E/5 and 10S/10 set to the
O O
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.
You can change the functions of the AF stop
O O
button using the camera’s Custom Function. For
details, please refer to the camera’s instructions.
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.
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