Flash sync is used to describe either the connection point where you plug an external electronic flash into your camera (usually a PC port or the camera’s hot shoe), or the fastest shutter speed at which your camera can “sync” with an external flash. Most DSLRs have top sync speeds of 1/125th to 1/320th-second, although some camera/flash combinations can be synced at speeds of up to 1/15,000th-second.
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