An interesting technique when photographing water droplets is to try to get a 2nd droplet to hit the first droplet as it emerges from the water, this technique is called ‘water collisions’ or ‘double drops’. The technique is very dependant on accurate timing of the spacing between the two droplets and the moment the flash guns are fired.
The set up to create the water collisions is:
- A tank suspended from the ceiling containing the fluid being used.
- A tube from the tank goes to a direct acting solenoid valve clamped above the receiving tray.
- The solenoid valve is connected to a small computer which is used to programme the timing required.
- The nozzle below the solenoid valve is positioned directly over a small IR trigger beam.
- The IR trigger beam is connected to an electronic timing delay which fires the camera after a programmed delay and the flash guns are fired wirelessly from the camera.
Canon 40D with 100mm macro lens 1/250sec @ f16 iso 100. Two flash guns running at 1/64th of full power provide the illumination