I am experiment with the light aimed at the camera lens trick. Right now, I have -11 -> +11 exposure, with 0 being a little dark, but not overly when the light is removed. I think it looks quite nice, but I want to be sure as I work through it so I can get just the right amount of light going through. Is this what Barry Green was trying to achieve? I have achieved it with a light trick that I put together that I can make quite cheaply and easily. The question is, how do I know if this is exactly the right range for exposure? Thanks