Please come in and talk about the director. What is a depth of field lens? What is the sense of vertical extension of space?

The depth of field of a lens is produced by the focal length of the lens, which usually has the following functions:

1. Highlight the leading role (fixed focus) 2. Explain the relationship between the protagonist and the surrounding environment, such as pushing the camera from the face of the person who is studying to the mouse in the corner behind him. Explain the relationship between the first perspective and the protagonist. For example, in the movie, the camera is pushed to Kane who is playing in the distance by Kane's mother who is signing an agreement about Kane's life. 4. Explain what is happening on a line (such as a group of soldiers lying neatly on a long table and carefully wiping their guns, then the lens can change the focal length from far to near or far, resulting in a very impactful display effect) or the beautiful scenery on a line (such as the lens flowing from the sky to a distant mountain and then to a lake below the mountain, flying waterfowl, depth of field lens is usually used when the camera is fixed, but if the first angle of view on the chariot is deliberately displayed, The sense of longitudinal extension of the exceptional space is more complicated: from the color point of view, the simple style is cold, or it is dominated by primary colors or light colors. Log color can reflect the natural beauty of wood itself, while white can realize the sense of longitudinal extension in a seemingly narrow space, which has a perspective effect, and dark color is often a perspective. From the point of view of lens stretching, a fixed camera or video camera can change the spatial sense of an object by adjusting the distance change of the external scene, while increasing the gradient or increasing the shooting angle can change the spatial depth. I'm not a professional director, just a hobby. I hope I can help you.