Canon EOS 30D Manual De Instruções

Página de 200
96
AE lock enables you to lock the exposure at a different place from the 
point of focus. By locking the exposure, you can recompose the shot 
while maintaining the same exposure setting. This is called AE lock. It is 
effective for backlit subjects.
1
Focus the subject.
 
Press the shutter button halfway.
X
The exposure setting will be displayed.
2
Press the <A> button. 
(0)
X
<A> lights in the viewfinder to 
indicate that the exposure setting is 
locked (AE lock).
 
Each time you press the <A> button, 
it locks the current exposure setting.
3
Recompose and take the picture.
 
If you want to maintain the AE lock 
while taking more shots, hold down 
the <A> button and press the shutter 
button to take another shot.
A
 AE LockN
AE lock indicator
 
If the AF mode is One-Shot AF or AI Focus AF (when not AI Servo AF) and 
the metering mode is <q> (Evaluative), pressing the shutter button halfway 
will automatically set AE lock at the same time when focus is achieved.
 
The AE lock effect will differ depending on the AF point and metering 
mode. For details, see “AE Lock” (p.178).