Canon EOS 1 V HS - Manual (Page 112)

Custom Function Settings
C.Fn-19 Lens AF stop button function switching
The function of the AF stop button provided with super telephoto Image
Stabilizer lenses can be shifted to the AF start button or AE lock button.
No. Description
0
AFL
AF stop
1
AF
AF start
2
AEL
AE lock while metering is
active
3
Automatic selection of 45
focusing points when pressed
4 AfMODE
Toggle between One-Shot AF
and Al Servo AF
5
IS
Turn on Image Stabilizer
C.Fn Function
C.Fn-19
Lens AF stop button
function switching
C.Fn-19-1. AF operates only while the AF stop button is pressed. While
the button is pressed, AF operation with the camera is disabled.
C.Fn-19-2: When the button is pressed while metering is still active, AE
lock takes effect. Convenient when you want to focus and
meter separately.
C.Fn-19-3. One of the 45 focusing points is selected automatically
only while you press the button. It switches from manual
focusing point selection to automatic focusing point selection.
Convenient when you are no longer able to focus track a
moving subject with a manually-selected focusing point in the Al
Servo AF mode.
C.Fn-19-4: In the One-Shot AF mode, pressing the button switches to Al
Servo AF mode only while the button is pressed. In the Al Servo
AF mode, pressing the button switches to One-Shot AF mode
only while the button is pressed.
Convenient when you need
to keep switching between One-Shot AF and Al Servo AF
for a subject which keeps moving and stopping.
C.Fn-19-5: With the lens’ IS switch already ON, the Image Stabilizer
operates only while you press the button.
110