sentences:  The photographer cues the participants that they will count down and say “open” and that they need to be absolutely motionless during the explosion of the flash for two seconds.With the air-driven, lemon-sized rubber bulb release which opens the Packard shutter in one hand, and a switch which ignites the flash lighting and exposes the film in the other, the photographer gives their cue, opens the shutter, ignites the flash waits until the light diminishes and releases the bulb which closes the shutter.The assistant hands the dark slide to the photographer who slides it back into the film holder so the exposed film is protected and the film holder is taken from the back of the camera and placed into a light safe bag.