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C.Fn-12 Switch to center AF point with the <3> button
0:Disabled
1:Enabled
Press the <3> button to immediately switch to the center AF
point. Convenient if you often use the center AF point.
C.Fn-13 Lens AF stop button function
0:AF stop
1:AF start
AF operates only while the AF stop button is pressed.While you
press the button, AF operation with the camera is disabled.
2:AE lock while metering
When you press the button while metering timer is still active, AE
lock takes effect. Convenient when you want to focus and meter
separately.
3:AF point selection method switching (between automatic and
manual).
In the manual AF point selection mode, holding down the button
switches to automatic AF point selection. Holding down the button
switches from manual AF point selection to automatic AF point
selection immediately. Convenient when you are no longer able to
focus track a moving subject with a manually-selected AF point in
the AI Servo AF mode.
In the automatic AF point selection mode, holding down the button
selects the center AF point.
4:AF mode switching (between One-Shot AF and AI Servo AF)
In the One-Shot AF mode, holding down the button switches to AI
Servo AF mode. In the AI Servo AF mode, holding down the button
switches to One-Shot AF mode. Convenient when you need to
keep switching between One-Shot AF and AI Servo AF for a
subject that keeps moving and stopping.
5:IS start
With the lens’ IS switch already ON, the Image Stabilizer operates
only while you hold down the AF stop button.
Custom Function Settings
The AF stop button is provided only on super telephoto lenses.