what I'm trying to accomplish is this: I want to shoot with white background using a 580ex shoot through an umbrella and a reflector for a fill. I want to get the background to be white. So, my understanding is that I need a background light.
now couple of questions:
1. what is the best option (best meaning cheap but good) for a background light? floodlights? cheap hot lights? also where to buy.
2. I only have a 580ex with 45" umbrella. Can I use this setup to shoot a group of about 5 people? does a bigger umbrella would make a difference? I do have a big 5'x3' reflector.
3. what is the biggest umbrella size for a 580ex?
4. If #4 is possible with only 1 main light and a reflector, what is the best setup for a group portrait?