Canon POWERSHOT G12 User Manual page 48

You can _ock the exposure or change it in 1/3 steps within a range of ±2 before
shooting.
Focus.
Press the shutter button ha}fway to focus.
Look the exposure.
After releasing the shutter button, press
the _ button to lock the exposure. The
exposure shift bar appears.
Press the _ button again to release the
lock.
......Change the exposure.
While watching the screen, turn the _ dial
to adjust the exposure.
Shoot.
Wind Filter suppresses noise when the wind is strong. However, unnatural
sound may result when used to record in locations with no wind.
Press the
MENU
button to choose [Wind
Filter] in the _ tab, then press the 4_
buttons to choose IOn].
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