this term is often confused with angle of field and field of view. The angle of view is the (diagonal) angle subtended by the scene captured in the photograph. This establishes the disc of best...
It depends on the range of the zoom, the size of the film format, and to some degree, the opinion of the photographer. For 35mm cameras, 50mm is considered "normal", and any lens that goes from about...
Briefly and without going into technical detail, a normal perspective lens produced what is seen in the viewfinder, and is normally 50MMM focal length, the wide - angle lens stretches the photograph...