Hello, I have been shooting at night. I have used a telephoto with 2.8 aperture, and the 100mm 2.8 macro lens. I don't use a flash at the request of the owner...distracting and images look washed out. I usually boost the iso, but I get so much noise even after post production. The shoot coming us is a high school reunion. Any tips that I might be missing. Also, they want most of the shots to be candid.