Canon 550D Fn IV Operation/Others, 195, AF/AE lock AE lock/AF, AF/AF lock, no AE lock

Models: 550D

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3Custom 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

<A> 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 <A> 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 <A> 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.

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Canon 550D instruction manual Fn IV Operation/Others, 195, AF/AE lock AE lock/AF, AF/AF lock, no AE lock, AE/AF, no AE lock