Depth of field

In the shooting, the process of adjusting the camera lens to clearly image the scene at a distance from the camera is called focusing. The point where the scene is located is called the focus point. Because the clarity is not an absolute concept, so before the focus The image of the scene (close to the camera) and behind a certain distance can be clear. The sum of the front and rear ranges is called the depth of field, meaning that the scene can be clearly photographed as long as the scene is within this range. The depth of field, first of all, is related to the focal length of the lens. A lens with a long focal length, a small depth of field, and a short focal length have a large depth of field. Secondly, the depth of field is related to the aperture. The smaller the aperture, the larger the value (for example, the aperture of f16 is smaller than the aperture of f11), the greater the depth of field; the larger the aperture (the smaller the value, the aperture of f2.8 is greater than f5.6). The smaller the depth of field is. Secondly, the foreground depth is less than the depth of field, that is, after precise focusing, the scene in front of the focus point can be clearly imaged only for a short distance, and the scene behind the focus point is clear for a long distance.