Canon Speedlite 320EX - Manual (Page 23)

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By pointing the flash head toward a wall or ceiling, the flash will bounce
off the surface before illuminating the subject. This can soften shadows
behind the subject for a more natural-looking shot. This is called bounce
flash.
Change the Bounce Direction
You can turn the flash head as shown.
Bounce flash is normally done with the flash head in the extended
position.
Bounce Flash
If the wall or ceiling is too far away, the bounced flash might be too weak
and result in underexposure. If the picture appears dark, use a larger
aperture opening (smaller f/number) and try again. You can also increase
the ISO speed when using a digital camera.
The wall or ceiling should be plain white for high reflectance. If the
bounce surface is not white, a color cast may result in the picture.
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