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C.Fn-03 is unused.
3
Custom Function Settings
C.Fn-01 Viewfinder display during exposure
1: Displays the exposure information and number of remaining shots
during continuous shooting.
C.Fn-02 Shutter release without card
1: The shutter button will not work without a memory card in the
camera. This prevents shooting without a memory card.
If there is no memory card and you press the shutter button,
“Card” will blink on the top LCD panel and in the viewfinder. It
indicates that C.Fn-02-1 is in effect.
C.Fn-04 Shutter button/AE lock button
1: You can focus at one location and obtain AE lock at another
location in the scene. Press the <w> button to autofocus and
press the shutter button halfway to attain AE lock.
2: In the AI Servo AF mode, you can press the <w> button to stop
the AF operation momentarily. This prevents the AF from being
thrown off by any obstacle passing between the camera and
subject. The exposure is set at the moment the picture is taken.
3: This is useful for subjects which keep moving and stopping
repeatedly. In the AI Servo AF mode, you can press the <w>
button to start or stop the AI Servo AF operation. The exposure is
set at the moment the picture is taken. Thus, the focusing and
exposure will always be at the optimum point as you wait for the
decisive moment.
C.Fn-04 and C.Fn-19-0/1/2 (p.153) both have AF start/stop and AE
lock functions. If you have set both these Custom Functions and you
execute both Custom Function operations, the latter operation will not
work. The only exception will be when AF stop is executed after AF
start.