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Dealing with red-eye
When you photograph a person in dim light using flash, the pupil of the eye will sometimes appear red. Under low light, the
pupils of the eye dilate for better vision. Red-eye is caused b y light from the flash entering the dilated pupils and being reflected
back to the lens. Red-eye reduction causes a preliminary flash to fire before the actual picture is taken. This causes the pupi l to
contract, reducing this reflection. When the actual flash exposure is made, the degree of reflection is minimized, thus reducing
red-eye.
When using red-eye reduction mode
Ask your subject to look directly into the camera.
Approach as closely as possible to make your exposure.