What does angle of view mean in optics?

In optics, the field of view angle refers to the range of scenery seen from the eyes or camera lens. Perspective is called perspective or perspective. Its size is determined by the focal length of the lens, the size of the photosensitive element and the actual shooting distance. The larger the viewing angle, the wider the shooting range. Angle of view is a very important parameter for photographers or viewers.

Different angles of view will have great differences in the effect of shooting or watching. When taking wide-angle photos, the field of vision is larger, and a wider scene can be taken. If you want to shoot vast landscapes or buildings, a wide-angle lens is the first choice. When taking telephoto photos, the angle of view is smaller and you can focus more on some details of the subject. The choice of viewing angle will also affect the picture composition and color saturation.

Perspective plays different roles in different industries. In the medical field, doctors need to observe the cell structure of patients through microscopes or other optical devices. The smaller the field of vision, the more they can observe the details. In the aerospace field, the choice of perspective needs to be more accurate. The camera of an airplane or satellite needs to shoot the scenery in the sky, and in order to capture enough information, it is necessary to choose a larger field of view. Different industries have different requirements for viewing angles, and reasonable selection can make optical equipment more suitable for practical application scenarios.