Canon A580 - Manual (Page 90)

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You can set the exposure and focus separately. This is effective when
shooting on ski slopes, beaches and other scenes where there is an
extremely strong contrast between the background and a backlit
subject, or a mix of bright and dark areas. You can set an exposure
that best matches the shot you wish to take.
Locking the Exposure Setting (AE Lock)
Available Shooting Modes p. 189
1
Turn on the LCD monitor.
2
Focus the camera on the subject on which you
wish to lock the exposure setting.
3
Lock the exposure and shoot.
Still Images:
1. Press the button to select
(Off).
2. Press the shutter button halfway and press the button.
• The exposure is locked and displays.
3. Re-aim the camera to compose the shot as desired, and press
the shutter button fully.
• To release the AE lock, press the
button again.
Movies:
1. Press the
button.
• The exposure is locked (AE lock) and the exposure shift bar
appears.
2. Use the or button to change the exposure and shoot.
• To release the AE lock, press the button again. Pressing
the MENU button or changing the white balance settings, My
Colors settings or the shooting mode, also releases the AE
lock.
Use the FE lock to shoot when you want to use the flash.