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front-curtain sync

The flash fires aninstant after the front curtain of a focal plane shutter has completed its travelacross the film plane. This is the way the camera operates with the flash sync modeat Normal Sync. (See Rear-Curtain Sync .)

mirglossary

front-curtain sync

A technique in which the flash fires an instant after the first (front) curtain of a focal plane shutter has completed its travel across the film plane. See also Rear-Curtain Sync.
nikongrossary