Canon A550 - Manual (Page 44)

42
You can set the exposure and focus separately. This is effective
when the contrast is too strong between the subject and
background or when a subject is backlit.
To Release the AE Lock
Press the ISO button.
Locking the Exposure Setting
(AE Lock)
Shooting Mode
You must set the flash to . The AE lock cannot be set if
the flash fires.
1
Turn on the LCD monitor.
2
Focus on the part of the subject on which
you wish to lock the exposure setting.
3
Press and hold the shutter button halfway
and press the
button.
z The icon will display.
4
Re-aim the camera to compose the shot as
desired and press the shutter button fully.
z In mode, AE lock can also be set/canceled (p. 37).
z You can use the FE lock when using the flash (p. 43).