Canon POWERSHOT SD3500 IS Digital ELPH User Manual page 93

You can make the main subject, such as people, appear bright by having the
camera provide the appropriate illumination with the flash. At the same time,
you can use a slow shutter speed to brighten the background that the light
from the flash cannot reach.
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Touch ,_A then touch _*.
Touch _ again to make the setting.
Once set, _ will appear on the screen.
Shoot.
.......... Even if the flash fires, ensure that the
subject does not move until the shutter
sound ends.
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