What is the relationship between focal length and viewing angle in photography?

When the light of the scene passes through the lens in a nearly parallel way, it will gather behind the lens to form an image, which is called focus. The distance from the center of the lens to the focus is called the focal length. In fact, most shots are composed of multiple shots. In this multi-lens system, the algorithm of focal length is based on the focal length between the second principal points behind the central point of the whole lens group, and the focus is the position of the photosensitive element of the digital camera. The focal length is generally expressed in mm.

Angle of view, also known as drawing angle, is the range of pictures that a lens can shoot. A large viewing angle means a large shooting range; A small viewing angle means that the lens can shoot in a small range.

The focal length is inversely proportional to the viewing angle. The shorter the focal length of the lens, the larger the shooting angle, which means that the larger the viewing angle, the more scenes the viewfinder can accommodate. On the other hand, the longer the lens, the smaller the shooting angle, that is, the smaller the viewing angle, the less scenery the picture can accommodate. The above two photos only observe the influence of focal length on the picture by changing the focal length of the lens on the premise that the distance between the photographer and the subject is fixed.

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