Canon SC A60 - Manual (Page 98)

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Setting the Aperture
The aperture adjusts the amount of light that passes
through the lens. Selecting a lower aperture value
(opening the aperture) allows you to fade the background.
A higher aperture value (closing it) brings the entire range
from foreground to background into focus.
1
Turn the shooting mode dial to .
The aperture value appears on the LCD monitor if it is on.
2
Select a value using the left or right
button.