This image shows the collision of two water drops. Using a device made by Cognysis, one drop was released from a nozzle into a pool of water and then, milliseconds later, another drop was released. The first drop hit the water pool and bounced up, colliding with the second drop. At that instant, two flash units were triggered by the Cognysis control box. I placed one flash on either side of the setup, and taped to the flash heads were pieces of colored gels. I used an aperture of f/32, a shutter speed of 1.3 seconds, and an ISO of 400. The exposure was determined from several test shots. I could vary the exposure by changing the distance between the flash units and the water drops. By changing the position of the flashes and changing the colored gels -- as well as the precise timing of the collision -- many different kinds of abstracts can be created. I used my 100-400mm Canon zoom for this shot along with an extension tube. This made the working distance about two feet. Had I used a 50mm macro lens, the front glass element of the lens would have gotten wet.
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