Canon EOS-1Ds Instruction Manual page 138

Custom Function Settings
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C.Fn-18
C.Fn-19
C.Fn-20
138
Switch to registered AF point
1: Press the < > button to switch to the registered AF point.
2: You can switch to the registered AF point only while you
press the < > 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.
If C.Fn-04-1/3 is also set, you can press the <
switch to the registered AF point and start the AF at the
same time.
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, holding down the
button selects the center AF point instantly.
4: In the One-Shot AF mode, pressing the button switches to AI
Servo AF mode only while the button is pressed. In the AI
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 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.
The AF stop button is provided only on super telephoto
lenses.
AI Servo tracking sensitivity
1 or 2: Prevents the autofocus from being thrown off by any
passing obstruction coming between the camera and
subject.
3 or 4: Effective when you want to consecutively photograph
multiple subjects located at random distances.
This Custom Function does not affect the AI Servo AF
tracking speed.
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