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Actually it isn't a flash just a bank of LEDs on a simple line switch. I have found it better to prelight the scene before taking the picture. Having the lights on attracts people to the photo booth. Though as, a mentioned, it would be easy enough to add a relay to simmulate a flash. If so I would have it have it on through pose up to taking the picture and may be lengthen the time between poses. The other option might be to connect a flash to the camera (the type that has an extension cable) and build a suitable retro surround for it.