Canon A590 IS - Manual (Page 78)

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The aperture adjusts the amount of light entering through the lens.
When you set the aperture, the camera automatically selects a shutter
speed to match the brightness.
Selecting a lower aperture value (opening the aperture) allows you to
blur the background and create a beautiful portrait.
A higher aperture value (closing the aperture) brings the entire range
from foreground to background into focus. The larger the aperture
value, the greater the range of the image brought into clear focus.
Setting the Aperture
Available Shooting Modes p. 201
1
Set the mode dial to .
2
Set the aperture value.
1. Use the or button to change
the aperture value.
3
Shoot.
• If you press the shutter button halfway and the shutter speed is
shown in red, the image is underexposed (insufficient light) or
overexposed (too much light). Use the
or button to adjust
the aperture value until the shutter speed shows in white.
Some aperture values cannot be selected depending on the
zoom position
(p. 75) .