The lens directs and focusses light rays onto a camera's sensor chip. It is the most important part of a camera, and often also the most expensive. As a result, its characteristics significantly affect the overall quality of the photos and the camera itself.
An important parameter is the wide angle range of the lens, which is the maximum angle that a camera can capture. It is expressed in 35mm format. Wide-angle lenses are considered those with a wide angle range of less than 35mm, while ordinary cameras have a wide angle range of about 40mm.