What is air sense?

Later, I took a lot of photos, and found that some things I took looked very stereoscopic and vivid, but sometimes they looked very flat, so I thought of the concept of "air sense". So I searched the Internet and found the explanation of air sense in Baidu Encyclopedia: the word air sense comes from painting. In painting, it refers to the change of light due to the different distance and angle through the air. Generally speaking, the farther an object is, the lower the contrast, the less details and the bluer the color. And the explanation found on another website: the sense of air actually comes from the perspective of air in painting skills. Due to the loss and distortion of light passing through different distances in the air, the color changes slowly with the change of distance, which conforms to the habit of eye observation and also brings the texture of the air. In other words, air sense is the antonym of "transparency", and air sense is the delicate expression of low contrast. Through the expression of color in photos, people can understand the quality of air and the distance before and after, and at the same time, two more general words, sense of space and sense of scene, are derived. As can be seen from the above two paragraphs, "sense of space" is actually a kind of "sense of space", that is, the concept of making the picture close to the actual picture seen by human eyes and reflecting the distance between virtual and real space. Photography /Max Drukpa determines whether a photo has an air sense, mainly in the following aspects: 1, air permeability, that is, the number of particles in the air, the more particles, the easier it is to reflect the air sense-of course, if it reaches the level of fog, it will be too late; 2, light, backlight, side light will be easier to express the sense of air (three-dimensional) than the front light; 3, the background level, if the background has rich levels, it can better express the sense of air. For example, using an extended street as the background will better express the sense of space than using a wall; 4, aperture, not just a large aperture can show a sense of space, depending on the subject, but don't choose the largest aperture when shooting close-ups, but let the scene gradually blur, there is a natural transition process, closer to the human eye (some people mentioned that the maximum should not exceed 2.8, others think it is 3.2); 5, focal length, 50MM is the most suitable focal length for the human eye (relative to the full frame). In addition, some people think that the old lenses with single-layer coating can better reflect the air sense than the modern lenses with multi-layer coating. It is difficult to judge this, but it is true that film photography is often more stereoscopic than digital photography. 1, the best time is in the early morning, and the air contains more water vapor; 2. Choose scenes with a certain depth, such as streets and Woods. 3, choose side light or backlight, rather than shun light (is it familiar? ); 4. shoot with a focal length of 50MM and an aperture of about F3.2