It's simply the difference in the color range of each cameras and the difference in the way the cameras are rendering the green. You can even see differences with different lenses. Some lenses produce different colors than others with the same camera. The cause there is the type of lens coatings and the angle of the light.
so the fact of the matter, is to basically get to know your camera, get to know your glass, get to know your lighting for your studio, and make your workflow go from there?
Ill take some more test footage during the week and see what I can come up with. Since our shoots are set specific, Ill see if I can perfect the "look" and save them to the camera. That should save us some set up time.
Just an update for you - It definately was a "User issue" with the R3D RAW and keying.
As you said, it is all about the difference in camera, lens and lighting, or ways that the camera reacts in lighting.
We are seriously underlighting at the moment. When I recorded the last time, alongside another camera, the keying was great for their take, but absolutely horrible for the R3D - Widest Aperture, High (within reason Gain) slightly slower shutter speed, as no motion blur was required, and still, the keying was a nightmare.
I then took a greenscreen outside, under the sunlight, and proceeded to pull an almost perfect, "One Key Key" of our editor standing in front of it.
So I will take the next week or so to re-look at our lighting, and maybe get a 2000W blondie or two on the set as well.
Have a great week, and thank you for your continued input By the way, we have finally completed the shows intro! What a milestone!
Epsidoe shooting starts shortly - what fun!
Cheers - Pierre