Nikon coolpix A900 Reference Manual page 69

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Auto with Red-eye Reduction/Red-eye Reduction
Pre-flashes are fired repeatedly at low intensity before the main flash, reducing the red-eye
effect. If the camera detects red-eye while saving an image, the affected area is processed to
reduce red-eye before the image is saved.
Note the following when shooting:
Because pre-flashes are fired, there is a slight lag between when the shutter-release
button is pressed and when the image is shot.
More time than usual is required to save images.
Red-eye reduction may not produce the desired results in some situations.
In rare cases, red-eye reduction may be applied to areas of an image unnecessarily. In
these cases, select another flash mode and take the picture again.
Shooting Features
Flash Mode
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