Canon IXUS 120 IS - Manual (Page 98)

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You can set the exposure or change it in 1/3 steps within a range of ±2.
Focus.
● Press the shutter button halfway to focus.
Lock the exposure.
● After releasing the shutter button, press
the
o button to lock the exposure. The
exposure shift bar appears.
● Press the o button again to release the lock.
Change the exposure.
● While watching the screen, press the qr
buttons to adjust the brightness.
Shoot.
AE Lock/Exposure Shift