I tried direct light painting first, but it didn't give me the quality of light I was looking for. I was inside a little canyon and ended up bouncing light from my flashlight off the rock wall behind the camera for 20 seconds of the 30 second exposure. Vignetting was a result of shooting at 16mm. The Canon EF 16-35mm f/2.8L USM II is an awesome lens, but definitely suffers near the edges at 16mm.
Oh, and I'm incredibly impressed with what the 5D MKII delivers at ISO 3200. :)
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