Canon A590 IS - Manual (Page 76)

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When you set the shutter speed, the camera automatically selects an
aperture value to match the brightness.
Faster shutter speeds allow you to catch an instantaneous image of a
moving subject, while slower speeds create a flowing effect and allow
you to shoot without a flash in dark areas.
Setting the Shutter Speed
Available Shooting Modes p. 201
1
Set the mode dial to .
2
Set the shutter speed.
1. Use the or button to change
the shutter speed.
3
Shoot.
• If you press the shutter button halfway and the aperture value is
shown in red, the image is underexposed (insufficient light) or
overexposed (too much light). Use the
or button to adjust
the shutter speed until the aperture value shows in white.
The nature of CCDs is such that noise in the recorded image
increases at slow shutter speeds. This camera, however,
applies special processing to images shot at shutter speeds
slower than 1.3 seconds to eliminate the noise, thereby
producing high-quality images (Nevertheless, a certain amount
of processing time may be required before the next image can
be shot).