This passage discusses the concept of angle of view, also known as field of view, in photography.

The angle of view refers to the extent of the scene captured in a photograph, expressed in terms of angles. It’s also known as the field of view.

When photographing a subject, determining the lens’s angle of view is crucial. This angle is determined by the lens’s focal length and the camera’s sensor size.

In lens specifications, the range captured when the camera is held horizontally is described in terms of horizontal, vertical, and diagonal angles of view. If only one angle is provided, it’s typically the diagonal angle of view.

Lenses with a wide angle of view are called wide-angle lenses, while those with a narrow angle of view are called telephoto lenses.