I just realized after reading that I must be a little nicer with what I said, it is not a bad thing if a photographer does not understand the physics of photography, it was ignorance on my part to state it that way but I will have to say that this is as important as knowing what f-stop is, or what iso does, it is the foundation on which every camera in the world is built on, long before DSLR's & even regular SLR's literally back when Aristotle was scratching his head wondering why images projected through a pinhole appeared upside down.