While shooting the Sarah Chang concert, I felt that the low light conditions were the most challenging that I had faced to date. Well, the anti was raised last night. The dark venue and colored lights played havoc with white balance and the simple availability of light. I shot this concert in Av mode at 4.0 (wide open) at 3200 ISO with a 70-200mm 4.0L without flash. Although I didn't think that these images would work out due to the grain of the high ISO, I had to continue as these were the only settings that would allow me to stop the blur of the performance. Come on Canon 1DX! I need that low light sensitivity.