Light, the crucial element of photography or painting is something we often under-analyze when taking pictures. One of the reasons is the marvelous capacity of the human eye and brain the "see" the image that we want. Unfortunately or maybe fortunately the "film" or CCD is more objective. Exposures using incandesent light have an entirely different color content than hologen or flouresent. Even in the B&W arena the dynamic range of the eye is greater than film. The ZONE System is a recognition of that condition. Our photography percentage of good to acceptable images improves the more we analyze the ambient light conditions prior to even composing the picture. As I start thinking images and taking more pictures I am constantly reminded by my monitor of any situation where I have missed the "check the light" step. BILL