subject as soon as the front curtain gets out of the way, but the
ambient light continues exposing the subject before the rear
curtain closes, and since it is moving you may see a ghostlike
blur before or in front of the well-exposed moving subject in
the picture. This can be seen at shutter speeds as fast as 1/60s
if ambient light is strong enough and the subject is moving.
Red-Eye Reduction
Red-eye reduction is not really a flash mode (see
Figure 12-4). It simply means that the AF-assist illuminator
shines brightly in the face of your subject before the flash
fires using Front-curtain sync mode. It is hoped that the bright
AF-assist illuminator will cause your subject’s pupils to close
somewhat and reduce the red-eye effect. It acts like you are
using Front-curtain sync mode otherwise.
Figure 12-4. Red-eye reduction
Red-Eye Reduction with Slow Sync
Red-eye reduction with slow sync works the same way as
Slow sync, except that the AF-assist illuminator light shines
before the flash fires (see Figure 12-5). This lets you take
pictures with an emphasis on ambient light while preventing
the extra flash exposure from causing red-eye.
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