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Tricolor Triple Exposure

35mm camera
90mm macro lens

For this high-speed triple exposure of 3 separate clear lit light bulbs I used the tricolor (RGB) filter technique.
A light bulb socket was firmly mounted to a table over a black backdrop with the camera mounted on a tripod and sandbagged to keep everything in registration for all 3 exposures. A pellet gun was mounted to a V support with the tip of the barrel exactly 48 inches from the bulb for all 3 exposures. A sound trigger was placed close to the pellet gun to pick up the sound of the gun going off. The sound trigger was connected to the input of a delay module who's output in turn was connected to an electronic cable release. By adjusting the delay to correspond with the pellets piercing the lit light bulbs I captured the filaments still lit with the hot gasses escaping before the bulb actually exploded. I recocked the shutter after each exposure and changed the bulb and filter 3 times. The repeatability of both the electronic and mechanical timing was critical.
Note: This shot could not have been achieved using open flash technique as the lit bulbs would have totally washed out the image.

Photo by Peat

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