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I was just asked last night to take a portrait of my wife's extended family when visit for the holidays. In all there will be 11 of us in the shot (one being my 1 year old setting on a lap). I have the group pose already thought out, 7 people standing and 3 setting in front one of the ones in front will be holding my 1 year old. I figured with two rows and one setting, I shouldn't have to worry about shadows on faces. I am not planning on having a special background. We will be taking the pictures in a very large church event room which has roughly 20' ceilings and has one outside wall that has a lot of windows in it that face east.
My dilemma is I'm not sure if I have enough light/modifiers for that large of a group. As it stands now, I have one AB800 and two flashes (one SB-900 and one Yongnuo 565ex). As far as modifiers I have one PCB large soft box which is 32x40, one 43" white shoot through umbrella without a black cover and one 43" soft silver umbrella.
I had thought about two different lighting setups. The first would be putting the AB800 behind the camera at about 8' and getting a 60" shoot through umbrella and hope I have enough even spread. I'm thinking I might run into an issue with having enough power since I will have to back it away from the group more.
The other setup I was thinking about was putting the AB800 on one side of the group with a 60" umbrella and then putting the flashes with smaller umbrellas on the other side. I'm not sure how that would look using two umbrellas on one side.
I'm thinking that I might need to add another monolight and another modifier (or two) to complete this task. Any thoughts?
I am aware that I can bump up ISO a bit to help with lack of light, but I would like to keep it at 200-400 ISO if possible on my D700.