Originally Posted by triton3k
I have a 5DMKIII as well and on 2 occasions I used it at events that went from mid day to the night and it just wasnt great at night for me. Could be since at that time I wasnt bumping the ISO that far up and since I was going from photo to video.
Yeah, there's no hope without getting the ISO up. One way to go, as mentioned, is Auto ISO. I like Aperture preferred and then control SS with ISO and/or aperture. There are a number of options, but mainly keep an eye on the SS.