Andrea Biagianti submitted this image taken with a Nikon D300, with an exposure of 1/2000sec at f/4.5, ISO 640, with an exposure compensation of -1.0. Interesting settings, I realize the fast shutter speed was set to freeze the walkers in place but a slower shutter would have still worked. I would recommend a smaller aperture, which I realize would cause a slower shutter but the people should still be frozen in place and the result would give you more depth of field. If the depth of field obtained here is exactly what was intended then I would suggest a lower ISO which again will affect the shutter but shouldn’t slow it down too much. The result would be a better quality file. The exposure looks off to me but I believe the intent was to silhouette the people.