In this episode on AdoramaTV, Joe McNally demonstrates how to achieve a line of sight TTL transmission at a distance while using colored gels to alter the color of the environment. Watch as he augments the color in a location by using artificial flash light while maintaining shutter speed in order to keep the ambient light. Joe will show you how to use a light box with a fabric grid, a red gelled flash, and a pop-up camera flash to create a compelling model shot. I am glad they showed a few unedited photos. Not only do you see the final product, but you also see how they achieved it.