When taking pictures, it can be used to help calculate exposure when relating f-stops, the aperture and shutter speed. When making prints, it can be used to fine-tune the exposure of the prints with the f-stop and time the paper is exposed to the image.
To be a professional photographer, you do not need to study photography.
probably not... however I've never heard of photography school. There are photography classes in college, you need a GED or diploma for college.
In order to be a photographer, you don't really need any qualifications. All you really need to know is the concepts of photography and exactly what you are doing. Also its good to have an understanding in what you are photographing, for example how skateboarders do what they do. You'll need good people skills if portraiture is what you want to get into. You can get qualifications in photography but in my opinion, all you really need is the passion, and a good portfolio..
In everyday life. I am fond of photography. I enjoy SLR photography.
Fast, telephoto lens