3Custom Function Settings

C.Fn III -6 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 you hold down the button, AF will not work on the camera.

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 9Auto/Auto 9Center

In the manual AF point selection mode, the button instantly switches to automatic AF point selection (among 45 AF points) while you hold it down. 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 button selects the center AF point only while you hold it down.

4: ONE SHOT zAI 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. The Image Stabilizer will not operate when you press the shutter button halfway.

6: Switch to registered AF point

While holding down the AF Stop button, press the <I> button to switch to the registered AF point. Press it again to switch to the previous AF point. To register the AF point, see page 224.

7: Spot AF

The focusing line sensor’s active area is made narrower to enable a narrower part to be focused. This works in all AF modes and with any AF point selection method. It is especially convenient during manual AF point selection. However, since it is difficult to keep the AF point on a moving subject, focusing might be difficult. With spot AF, the AF point will blink brighter than usual.

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