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3 Custom Function SettingsN
C.Fn III: Autofocus/Drive
C.Fn III -1 Lens drive when AF impossible
If autofocus is executed, but focus cannot be achieved, the camera can
either keep trying to focus or stop.
0: Focus search on
1: Focus search off
Prevents the camera from becoming grossly out of focus as it attempts
to focus again. Especially convenient with super telephoto lenses which
can become extremely out of focus.
C.Fn III -2 Lens AF stop button function
* The AF stop button is provided only on super telephoto IS lenses.
0: AF stop
1: AF start
AF operates only while the button is pressed. While the button is
pressed, AF operation with the camera is disabled.
2: AE lock
When the button is pressed, AE lock is applied. Convenient when you
want to focus and meter at different parts of the picture.
3: AF point: M 9 Auto/Auto 9 center
In the manual AF point selection mode, the button instantly switches to
automatic AF point selection only while you hold it down. This is
convenient in the AI Servo AF mode when you can no longer track the
subject with the manually-selected AF point. In the automatic AF point
selection mode, the button selects the center AF point only while you
hold it down.
4: ONE SHOT z AI SERVO
In the One-Shot AF mode, the camera switches to AI Servo AF mode
only while you hold down the button. And in the AI Servo AF mode, the
camera switches to One-Shot AF mode only while you hold down the
button. Convenient when you need to keep switching between One-Shot
AF and AI Servo AF for a subject which keeps moving and stopping.
5: IS start
With the lens’ IS switch already <ON>, the Image Stabilizer operates
when you press the button. With setting 5, the Image Stabilizer will not
operate when you press the shutter button halfway.
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