1603 Custom Function SettingsNC.Fn III -6 AF during Live View shooting0: Disable1: EnableDuring Live View shooting, you can interrupt the Live View imagedisplay and focus for as long as you hold down the <p> button.C.Fn III -7 Mirror lockupPrevents camera vibrations caused by the reflex mirror action which candisturb shooting with super telephoto lenses or close-up shooting. Seepage 98 for the mirror lockup procedure.0: Disable1: EnableC.Fn IV: Operation/OthersC.Fn IV -1 Shutter button/AF-ON button0: Metering + AF start1: Metering + AF start/AF stopDuring autofocusing, you can press the <p> button to stop theautofocusing.2: Metering start/Metering + AF startThis is useful for subjects which keep moving and stopping repeatedly.In the AI Servo AF mode, you can press the <p> button torepeatedly start or stop the AI Servo AF operation. The exposure is setat the moment the picture is taken. Thus, the optimum focusing andexposure will always be achieved as you wait for the decisive moment.3: AE lock/Metering + AF startConvenient when you want to focus and meter at different parts of thepicture. Press the <p> button to meter and autofocus, and pressthe shutter button halfway to attain AE lock.4: Metering + AF start / disableThe <p> button will not function.