Art Adams has posted the results from a very informative test with the Red camera. The results indicate that Red One tungsten-lit greenscreen footage can be improved if you use an 80D blue filter over the lens. This helps clean up noise in the recorded Blue channel, which isn’t nearly as clean as the Red and Green channels. With a blue filter, edges are improved and noise and digital grain is reduced, theoretically leading to a better chroma key in post. In fact, Art even goes to far as to suggest shooting with an 80D filter all the time, given enough light. One reason you wouldn’t want to shoot with the filter is that it cuts 1/2 to 2/3 stop of light transmission, which may be an issue depending on your light kit or scene limitations. It’s an informative writeup, and Art has included some very telling footage framegrabs that illustrate the issue. Definitely check this one out if you are working with the Red, or intend to.