When shooting video, the focal length becomes larger and the shooting distance is relatively far, so that the size of the subject in the picture remains the same, but the background angle becomes narr

When shooting video, the focal length becomes larger and the shooting distance is relatively far, so that the size of the subject in the picture remains the same, but the background angle becomes narrower. When the focal length is aimed at the person, the camera is moved backward, and the zoom ring keeps the depth of field and the size of the person constant. . Generally speaking, this technique expresses the feelings of helplessness of the characters.

There can be two layers of matting, one is the figure and the other is the background. You can also use the track, people and photographers stand on the mobile platform, and then pull it far away.

However, the effect of modern film and television is ultimately synthetic, and this effect is well controlled in the later stage.