Olympus D-550 Zoom - Manual (Page 57)

Using the flash
Shoot
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Fill-in flash ( )
The flash always fires every time the shutter button is released. This mode is
useful when you want to minimize shadows around the subject (such as the
shade of tree leaves on the subject’s face), in backlight condition, or under
artificial light such as a fluorescent lamp.
Flash off ( )
The flash does not fire even in low light conditions. Use this mode in situations
where flash photography is not desired or is prohibited, such as in an art
museum. You can also use this mode when you want to shoot a natural-
looking twilight or night scene.
The fill-in flash may not have the desired effect under excessively bright
light.
Since a slow shutter speed is automatically selected in low light
situations when in the flash off mode, the use of a tripod is
recommended to prevent your pictures from being blurred by camera
movement.