| Since I shoot with Nikon cameras, most of these lens references are based on my personal experiences with Nikon equipment. The general concepts however apply to any manufacturer.
The focal length of a camera lens is the distance between the center of the lens and the film/sensor when an in-focus image is formed of an object far away.
This fact causes the angle of view of the camera to be inversely proportional to the focal lens. Another way to look at it is: the... | 
