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A type of camera flash synchronisation, found on more sophisticated SLR
cameras, that fires the flash just before the second shutter blind closes. It’s
used with slow shutter speeds to photograph moving objects. As the movement will
be blurred before the flash freezes the subject it appears with a trail behind
it. Use normal front curtain sync and the trail will appear unnaturally in front
of the subject, making it look as though it is moving
backwards.








