
Vision in Blue
This is one of my oldest photos (that had some competition success that is). Taken on a river near Nelson, New Zealand, it was one of two photos that were my first published in a magazine (Photography International).
The effect you can see was all done in-camera. Firstly, the film used was Kodak Ektar 25 ASA – a top-quality print film available in the early 90s, and combined with a 4x Cokin neutral density filter, it allowed a shutter speed of 30 seconds! This gave the water a misty effect as it flowed over the rocks, and the mirror-like finish above the rockfall. The lower water looks rather different because I spent the whole 30 seconds throwing rocks into this area to continually break up the water surface. The rocks being thrown scared a trout out of the lower pond, which jumped up the waterfall at the right during the shot.
The final, and rather obvious difference is the unusual rock colouring. This was achieved by using a polarising filter combined with a Cokin Pola-Blue filter. The Pola-Blue is a polarising filter that looks clear when polarised light of one orientation passes through it, and becomes increasingly blue as the angle of polarised light changes relative to the filter. The secret here is that reflected light is polarised, as is the light reflecting off the wet rocks. Using the standard polariser to dial in a slight shade of blue for the entire scene, the combined assembly was then rotated so the rocks were producing polarised light at 90 degrees to the filter orientation (maximising the amount of blue for the wet areas).
I tried many times to recreate this effect again, but never achieved the same success that I did with this first attempt. In the end I lost the Pola-Blue filter when I was almost washed away trying to photograph the release of water from a dam a few years later. But that is a story for another day.