Definition: (1) Shutter mechanism or technique for synchronising shutter run with electronic flash exposure. * With diaphragm shutters the flash is fired as soon as the shutter is fully open. * With focal-plane shutters, the flash is generally fired as soon as the first curtain has traversed the width of the film-gate: the X-synch time is therefore the shortest time setting at which the first curtain has exposed the film but the second curtain has not started to cover the film. (2) The shortest shutter time setting at which X-synch is possible.

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