This shot took some planning! First the shot, next the explanation!
Helen and I ventured out onto her roof in London at sunset. I placed the Canon 1DsIII and 50mm f/1.2 on a tripod, focussed it and set it to f/2.0. A flash gun was off camera on a stand to the right of the shooting position.
Firstly Helen sat on the right hand side of the roof with a red wig on. Then, while she changed, I took a series of shots of the background to blend into an HDR.
Helen then posed on the left.
I merged three shots to an HDR for the background, blended in the two Helens and finally added some of the original sunset back in to enrich the sky!