When Your Camera is Fighting You Often cameras, especially prosumer rigs, will have auto features turned on that can make keying much more difficult. Be sure to turn off Auto exposure, auto-white balance and auto-focus. If any of these are left on, this means the green you’re trying to key will constantly be changing as your model moves. Even if you’ve hired a professional videographer, don’t make assumptions. Double check that he or she has turned these things off or you will spend hours trying to fix it.