All I say is they can be a gaint pain if lighting is not perfect. Do not even bother trying to film in a room that does not have black walls, ceiling and floor. If you light the screen right. the green/blue light will reflect back on to the model and make all manor of problems. If you can afford it use a chromamatte . you will have to put a spaicel led light on the lens of the cam. but you will never have light problems again. if you plann to do it often invest . you will thank me.
chromaMatte