A few weeks ago I went with a few friends to take a tour of the Atlantic Avenue Subway Tunnel (otherwise known as the Cobble Hill Tunnel), which is considered the world’s oldest subway tunnel.  I brought my camera and flash, and a pair of Pocket Wizard radio triggers. The triggers allow me to fire my flash when it’s physically separated from my camera. In the tunnel, I had an assistant (Eileen – thanks!) position the flash off-axis from the camera, which gave some interesting shadows and perspectives on the light. Besides the flash and a few flashlights, it was pitch black in the tunnel, so the exposure, focus, and flash exposure were all manual.