Visual proportion under three depth of field levels

In photography or film and television production, the depth of field is divided into close shot, middle shot and long shot. Foreground is the background of the whole picture, accounting for a relatively small proportion. By adjusting the focal length and aperture, the foreground can be blurred, and the definition of close shot or middle shot can be highlighted, thus achieving the effect of layering the picture and guiding the audience's attention. From the perspective of depth of field, perspective accounts for the smallest proportion of the three.