1973 Custom Function SettingsNC.Fn III: Autofocus/DriveC.Fn III -1 Lens drive when AF impossibleIf autofocus is executed, but focus cannot be achieved, the camera caneither keep trying to focus or stop.0: Focus search on1: Focus search offPrevents the camera from becoming grossly out of focus as it attemptsto focus again. Especially convenient with super telephoto lenses whichcan become extremely out of focus.C.Fn III -2 Lens AF stop button function* The AF stop button is provided only on super telephoto IS lenses.0: AF stop1: AF startAF operates only while the button is pressed. While the button ispressed, AF operation with the camera is disabled.2: AE lockWhen the button is pressed, AE lock is applied. Convenient when youwant to focus and meter at different parts of the picture.3: AF point: M 9 Auto/Auto 9 centerIn the manual AF point selection mode, the button instantly switches toautomatic AF point selection only while you hold it down. This isconvenient in the AI Servo AF mode when you can no longer track thesubject with the manually-selected AF point. In the automatic AF pointselection mode, the button selects the center AF point only while youhold it down.4: ONE SHOT z AI SERVOIn the One-Shot AF mode, the camera switches to AI Servo AF modeonly while you hold down the button. And in the AI Servo AF mode, thecamera switches to One-Shot AF mode only while you hold down thebutton. Convenient when you need to keep switching between One-ShotAF and AI Servo AF for a subject which keeps moving and stopping.5: IS startWith the lens’ IS switch already <ON>, the Image Stabilizer operateswhen you press the button. With setting 5, the Image Stabilizer will notoperate when you press the shutter button halfway.COPY
