Nearly Craig, soft box with a constant light source and these were composited 8-10 second exposures. It's a ridiculously simple setup but I love the effect. Speedlights don't work well on black car bodies I don't think, although fine for rims/details or lighter coloured cars.

Have been meaning to take a decent picture of the rig but haven't managed yet. Was going to do a setup shot at tonight's shoot but had to cancel for family reasons.

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Ryan