Canon EOS 20D 取り扱いマニュアル

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3 Custom Function SettingsN
146
C.Fn-17
Lens AF stop button function
0: AF stop
1: AF start
AF operates only while the AF stop button is pressed. While the 
button is pressed, AF operation with the camera is disabled.
2: AE lock while metering
When the button is pressed while metering is still active, AE lock is 
applied. Convenient when you want to focus and meter separately.
3: AF point: M -> Auto / Auto -> ctr.
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 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, 
holding down the button selects the center AF point instantly.
4: ONE SHOT <-> AI SERVO
In the One-Shot AF mode, the button switches to the AI Servo AF 
mode only while you hold it down. In the AI Servo AF mode, the button 
switches to the One-Shot AF mode only while you hold it down. 
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 
only while you press the button.
C.Fn-18
Add original decision data
0: Off
1: On
Data for verifying whether the image is original or not is appended 
to the image. When an image appended with the verification data 
is played back, the <
L> icon will be displayed. (p.104) To verify 
whether the image is original, the Data Verification Kit DVK-E2 
(optional) is required.
The AF stop button is provided only on super telephoto lenses.