133Menu Settings8Custom Function SettingsMENUC.Fn-01 Finder display during exposure1: Displays the exposure information and number of remainingshots during continuous shooting.C.Fn-02 Shutter release without CF card1: With C.Fn-02-1, the shutter button will not work if there is noCF card in the camera. This prevents picture taking withouta CF card.If there is no CF card and you press the shutter button, “ ”will blink on the top LCD panel and in the viewfinder. Itindicates that C.Fn-02-1 is in effect.C.Fn-03 ISO speed expansion1: You can expand the ISO speed to ISO 50. When this is set,“L” will be displayed.C.Fn-04 Shutter button / AE lock button1: You can focus at one location and obtain AE lock at anotherlocation in the scene. Press the < > button to autofocusand press the shutter button halfway to attain AE lock.2: In the AI Servo AF mode, you can press the < > button tostop the AI Servo AF operation momentarily. It prevents theAF from being thrown off by any passing obstruction comingbetween the camera and subject. The exposure is set whenthe picture is taken.3: This is useful for subjects which keep moving and stoppingrepeatedly. In the AI Servo AF mode, you can press the< > button to start or stop the AI Servo AF operation. Theexposure is set when the picture is taken. Thus, the optimumfocusing and exposure are always ready for the peakmoment.C.Fn-04 and C.Fn-19-0/1/2 (→p.138) both have AF start/stop and AE lock functions. If you have set both theseCustom Functions and you execute both Custom Functionoperations, the latter operation will not work. The onlyexception will be when AF stop is executed after AF start.
