Lee in San Francisco asks:
What are the best light diffusers for shooting large rooms? I have an immediate question about which umbrella to buy for my speed lights. I am trying to shoot very large rooms. What do you recommend?
Most real estate photographers only use umbrellas to diffuse their flash lighting when the walls and or ceiling is very dark or a strong color. Usually, you can get by just fine with bouncing your flashes off the ceiling, walls, or the ceiling/wall joint. How much diffusion you get when doing wall/ceiling bounces depends upon how far the flash is from the wall.
There are a couple of different approaches to using flash lighting to shoot real estate interiors:
It is useful to have a couple of 43" satin umbrellas with you to use when the walls/ceiling is dark wood or strange colors.