The problem that many users complain about with the Canon 5D Mk II is the autofocus abilities in low-light. These users claim it to be very poor and the clamors have forced Canon to revamp the focusing system as is seen in the 1D Mk IV and 7D. The other night here in New York City, there was a giant Lightsaber battle in Christie Park, put on by NewMindSpace. The situation called for extremely low light, extremely fast-moving subjects, and a dead flash that could not assist with focusing. So how did it hold up?