The larger the focal length of the camera, the larger or smaller the field of view?

The larger the focal length of the camera, the smaller the field of view.

Focal length is a measure of light convergence or divergence in an optical system, which refers to the distance from the optical center of the lens to the focal point of light convergence when parallel light is incident. An optical system with a short focal length has a better ability to collect light than an optical system with a long focal length. Simply put, the focal length is the distance from the focal point to the center of the mirror. Focal length f

Focal length, also known as focal length, is a measure of light convergence or divergence in an optical system, which refers to the distance from the center of the lens to the focal point of light convergence. That is, the distance from the optical center of the lens to the imaging plane such as the backplane, CCD or CMOS in the camera. An optical system with a short focal length has a better ability to collect light than an optical system with a long focal length.

The concept of focal length:

The metal tube of a camera or projector contains a group of lenses with radians on both sides or one side to form a comprehensive lens. The light emitted from different parts of the object, after passing through the lens, is focused on a point on the negative, so that the image has a clear outline and real texture. This point is called the focus. The so-called focal length is the distance from the point in the lens of the lens to the point where the light can be clearly focused.

Because when we take pictures, the distance between the object and the camera (lens) is not always the same, such as taking pictures of people. Sometimes we have to shoot the whole body, we will be far away, and we will be very close when we take a bust. That is to say, the image distance is not always fixed, so if you want to get a clear image, you must change the distance from the film to the optical center of the lens with the different object distance. The process of this change is what we usually call "focus".