Taking a family re-union picture

I just wondering what kind of light setting will require for a 20 people picture.
It will be indoor . Most likely in a family room without window.

Any advise will be appreciated

I would think a Lightsphere would be good but I've never used one before.

Check out: http://super.nova.org …s/Photographing​Groups.pdf

1st thank you for the advise.
I am going to setup the following after 48hrs of reading :
two 42" reflective umbrella on each side of my camera ( 600W CFL each) , 550EX on top of camera (full power) via ETTL .

The room setup is 9 ft deep and 16 ft wide and 8 ft white ceiling.

Let me know if i am crazy

tvnuts wrote in post #7413305
1st thank you for the advise.
I am going to setup the following after 48hrs of reading :
two 42" reflective umbrella on each side of my camera ( 600W CFL each) , 550EX on top of camera (full power) via ETTL .

The room setup is 9 ft deep and 16 ft wide and 8 ft white ceiling.

Let me know if i am crazy

If you are using studio flash units with optical slaves in them and are trying to trigger them with your Speedlite, you'd better turn all automation of the camera and the Speedlite off. In other words, do it with the camera and Speedlite both in manual mode.

There are a couple of reasons.

The first reason is that the slaves would trigger on the Speedlite's pre-flash and not on the main flash.

The second reason is that the camera and Speedlite work together to calculate the exposure needed (that's the purpose of the pre-flash). If you added extra flash sources at the same time as the Speedlite's main flash going off, there would be a very significant overexposure because the camera knew nothing about the extra light source(s).