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Lens AF stop button function switching
C.Fn-19
C.Fn
C.Fn-19
Function
Lens AF stop button
function switching
No.
0
1
2
3
4
5
AF stop
AF start
Turn on Image Stabilizer
Automatic selection of 45 focusing
points or center focusing point
selection when pressed
AE lock while metering is
active
Toggle between One-Shot AF
and AI Servo AF
Description
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.
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: In the manual focusing point selection mode, holding down the
button switches to automatic focusing point selection (among 45
focusing points).
Holding down the button switches from manual
focusing point selection to automatic focusing point selection on the fly.
Convenient when you are no longer able to focus track a moving subject
with a manually-selected focusing point in the AI Servo AF mode.
In the automatic focusing point selection mode, holding down the
button selects the center focusing point on the fly.
C.Fn-19-4: 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.
C.Fn-19-5: With the lens’ IS switch already ON, the Image Stabilizer operates
only while you press the button.
SEC.07 P095-114 (E) 29-01-2003 12:29 Pagina 110