Watch the video: how to capture cross-polarization effects
Believe it or not, the extraordinary colors on show in the image below aren’t the result of the overzealous use of Photoshop filters. In fact, they’re caused by an optical effect called cross-polarization.
So how does the result come about? Well, when certain objects are placed between two polarizing filters – one on your camera’s lens and one covering the light source – the light will behave in an unusual way, revealing wild and wonderful colors that wouldn’t normally be visible to the human eye.
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While the science behind the effect is complicated, it’s actually a really easy technique to get to grips with. Even better, you don’t need loads of expensive kit or accessories.
1. Go in a circle
First, get two polarizing filters. You’ll need a circular one to attach to your lens, and a second to go over the light source. The latter doesn’t need to be circular – a sheet of polarizing film is fine. We’re using a sheet of Lee 239 film on top of a lightbox.
2. Look for plastic
Plastic, especially the injection-moulded variety, works best for this technique because the cross-polarization effect reveals stress points in all their multicolored glory. Cutlery, cups, glass and stationery are all cheap, readily available and make perfect subjects.
3. Twist and turn
When you’re ready, place the objects on the lightbox and rotating the circular polarizer on your camera’s lens until you get the desired effect. As you rotate the filter, the intensity of the effect changes – at some points, the white light from the lightbox will become black.
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