The Reflecmedia Chromatte Small Blue Light Ring Kit is a great way to produce seamless chroma key photography. The basic question for chroma key (using a monochrome colored background behind your subject and then replacing it digitally with a different image) is: blue or green?
Blue is usually the choice for weather maps on TV news shows, but green is often used for digital media because digital cameras keep more detail in the green channel and green requires less light than blue.
This kit combines a background that's lightweight, flexible, and contains millions of glass beads that reflect light like cat's eyes; and a camera-mounted LED Light Ring that, when used together, produce a brilliant, but more importantly, even, blue background for easy chroma keying without seams, folds or creases.