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C.Fn-18 Switch to the registered AF point
1: Press the <P> button to switch to the registered AF point.
2: Switch to the registered AF point only while you press the <P>
button. When you release the button, the AF point selected
previously becomes active again. You can thereby easily switch
between the selected AF point and registered AF point.
C.Fn-19 Lens AF stop button function
1: AF operates only while the AF stop button is pressed. While the
button is pressed, AF operation with the camera is disabled.
2 : When the button is pressed while metering is still active, AE lock
takes effect. Convenient when you want to focus and meter
separately.
3 : In the manual AF point selection mode, holding down the button
switches to automatic AF point selection (among 45 AF points).
Holding down the button switches from manual AF point selection
to automatic AF point selection instantly. 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, the center AF point is
selected only while you hold down the button.
4 : In the One-Shot AF mode, the camera switches to AI Servo AF
mode only while you hold down the button. 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: With the lens’ IS switch already ON, the Image Stabilizer operates
only while you press the button.
If C.Fn-04-1/3 is also set, you can press the <P> button to switch to
the registered AF point and start the AF at the same time.
The AF stop button is provided only on IS super telephoto lenses.