I'll be photographing at a church in a month or so and will be photographing band performances taking place on a stage. I'm not allowed to use a flash. Here is the equipment I have : canon 6d, 70-300mm, 50mm1.8, 50mm1.4, 135mm f2. Just need some guidance on how to take the best quality pictures. I know I'll have to bump up my iso and will try to use a tripod for stability when possible. Any tip and suggestions is greatly appreciated.