Hi all, I'm doing a documentary photo shoot of a film festival tonight. There will be many low light situations. I can't use flash or lamps. Using a 5D mark III and 50mm Zeiss 2.0 and one leg Manfrotto tripod. Any advise how to prepare for the shoot? What should I keep in mind? I want to make portraits, catch the atmosphere of the festival. What camera settings would be best? Thanks, have a nice day.