Canon eos rebel t1i - Manual (Page 188)

3 Custom Function SettingsN
188
C.Fn IV: Operation/Others
C.Fn-10 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 perform 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.
C.Fn-11 Assign SET button
You can assign a frequently-used function to <0>. When the camera is
ready to shoot, you can press <0>.
0: Quick Control screen
When you press <0>, the Quick Control screen will appear. Press the
<S> key to select the desired function, then turn the <6> dial to set it.
1: Image quality
Press <0> to display the image-recording quality setting screen on the
LCD monitor.
Press the <S> key to select the image-recording quality, then press <0>.
2: Flash exposure compensation
When you press <0>, the flash exposure compensation setting screen
will appear.
3: LCD monitor On/Off
Assigns the same function as the <B> button.
4: Menu display
Assigns the same function as the <M> button.
5: Disabled