C.fn iv: operation/others – Canon 550D User Manual
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3
Custom Function SettingsN
C.Fn-8
Mirror lockup
0: Disable
1: Enable
Prevents camera vibrations caused by the reflex mirror action which can
disturb shooting with super telephoto lenses or close-up (macro)
shooting. See page 106 for the mirror lockup procedure.
C.Fn IV: Operation/Others
C.Fn-9
Shutter/AE lock button
0: AF/AE lock
1: AE lock/AF
Convenient when you want to focus and meter separately. Press the
button to autofocus, and press the shutter button halfway to apply
AE lock.
2: AF/AF lock, no AE lock
In the AI Servo AF mode, you can press the 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: AE/AF, no AE lock
This is useful for subjects which keep moving and stopping repeatedly.
In the AI Servo AF mode, you can press the button to start or stop
the AI Servo AF operation. The exposure is set at the moment the
picture is taken. Thus, the optimum focusing and exposure will always
be achieved as you wait for the decisive moment.
When 1 or 3 is set, pressing the Remote Switch (p.205) halfway will not
work.