So, I'm lighting a 40x20 greenscreen coved into a 20 foot floor, and I'm looking for thoughts/suggestions.
The stage doesn't have a cyc so I'm hanging a 40x20 rag, coving it at the bottom (18' high ceilings) and painting 20x40' of floor. (open to suggestions on this rig but that's more a question for grip)
The plan is for it to be a standing and lit greenscreen to visit over a 3 week shoot.
First question is digi vs chroma green. I lean chroma because there's less bounce back from the floor, and since chroma is darker it tends to naturally read at a stop under key (which i believe is optimal for keying) and I believe chroma is more common painted on built in cycs. However I am curious if any of you find it harder to key since the color is less saturated?
Then there is light selection and placement.
Super green kinos are nice, but I imagine problematic if the light falls on the actors. Also I don't want there to be a difference between the back wall and the floor. So I'm leaning towards a row of spacelight (prob 2k)
I should mention I'm shooting on the c300 - so the native iso is 850.
The primary question I have is:
Is there an easy way to calculate the spacing between the spacelights, as well as the height/distance from the wall and the floor?
If I place them 16 feet up and 16 feet from the wall, what math I remember tells me they will be 22 feet away from the cove, which drops the intensity by more then a stop - do I have to fill in the cove with additional units?
Thanks in advance!