Canon PowerShot G10 - Manual (Page 108)

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z Adjust the zoom setting before shooting. The combined
digital and optical zoom factor will display on the LCD
monitor. When the zoom factor displays in blue, the image
will deteriorate.
z You can perform the following operations before shooting the
movie.
- AF lock: If you press the MF button, auto focus will be fixed
at the current state. The icon and MF indicator appear
on the LCD monitor, and you can confirm the distance
between the subject and lens. You can cancel by pressing
the MF button again.
- Manual focus (p. 130)
- AE lock and exposure shift: this is effective on ski slopes
and the beach when the contrast is too strong between the
subject and background or where there are both light and
dark areas in the scene and it is desirable to adjust the
exposure.
1 Press the
button.
The exposure will lock (AE lock) and the exposure shift
bar will appear in the LCD monitor.
2. Use the control dial to adjust the exposure.
Press the button again to release the setting. Also,
the setting will be canceled if you press the MENU button
or change the white balance, My Colors or shooting
mode settings.