Canon EOS 1 Instruction Manual - Page 33

AI Servo Autofocus, AI Servo AF

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Page 33 highlights

Selecting the AF Mode P AI SERVO 3210 1 23 ● AI Servo AF Use this mode when taking pictures of moving subjects. The lens focuses the subject continuously while the shutter button is pressed halfway. AI Servo's predictive focus control* can track subjects moving toward or away from the camera. Exposure is determined immediately before the shutter is released. • In AI Servo AF mode, the viewfinder's in-focus indicator does not light up and the beeper does not beep even when the subject is in focus. • The in-focus indicator blinks if the subject cannot be focused. • Focus lock cannot be used in this mode, but autofocus can be temporarily suspended through Custom Function 4-2 (refer to pages 86-87). * Predictive focus control Predictive focus continuously measures the distance and speed of a subject that is moving at a relatively constant velocity, and then predicts the subject position so that the subject will be sharply focused at the instant of exposure. When using a manually selected focusing point, it is used for predictive focusing and lights red in the viewfinder. In automatic focusing point selection mode, cover the subject with the center focusing point for initial focusing. After that, even if the subject moves to a different focusing point, the camera's predictive focus function will continue to track the subject as long as it is covered by one of the focusing points. The focusing point does not light up. Custom Function (Refer to pages 86-87) Custom Function (Refer to pages 90-91) In AI Servo AF mode with predictive focusing (used for sports photography, etc.), this function lets you momentarily lock the focus using the AE lock button. In AI Servo AF mode, this function lets you select the focusing point with the quick control dial to manually track the moving subject. 33

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33
Selecting the AF Mode
●
AI Servo AF
Use this mode when taking pictures of
moving subjects. The lens focuses the
subject continuously while the shutter
button is pressed halfway. AI Servo’s
predictive focus control* can track sub-
jects moving toward or away from the
camera. Exposure is determined
immediately before the shutter is
released.
In AI Servo AF mode, this function lets
you select the focusing point with the
quick control dial to manually track the
moving subject.
* Predictive focus control
Predictive focus continuously measures the distance and speed of a sub-
ject that is moving at a relatively constant velocity, and then predicts the
subject position so that the subject will be sharply focused at the instant of
exposure.
When using a manually selected focusing point, it is used for predictive
focusing and lights red in the viewfinder.
In automatic focusing point selection mode, cover the subject with the
center focusing point for initial focusing. After that, even if the subject
moves to a different focusing point, the camera’s predictive focus function
will continue to track the subject as long as it is covered by one of the
focusing points. The focusing point does not light up.
AI SERVO
3
2
1
1
2
3
P
0
•
In AI Servo AF mode, the viewfinder’s in-focus indicator does not light up and the beep-
er does not beep even when the subject is in focus.
•
The in-focus indicator blinks if the subject cannot be focused.
•
Focus lock cannot be used in this mode, but autofocus can be temporarily suspended
through Custom Function 4-2 (refer to pages 86–87).
Custom Function
(Refer to pages 90–91)
Custom Function
(Refer to pages 86–87)
In AI Servo AF mode with predictive
focusing (used for sports photography,
etc.), this function lets you momentarily
lock the focus using the AE lock button.