Teach novice photographers 50 articles, what is focusing?

The English name of Focus is focus. Generally, digital cameras have various focusing modes, namely, auto-focusing, manual focusing and multiple focusing modes. Traditional cameras use a similar visual ranging method to achieve autofocus. The camera emits an infrared ray (or other rays), determines the distance of the subject according to the reflection of the subject, and then adjusts the lens combination according to the measurement result to realize automatic focusing. Manual focusing: it is a focusing method that adjusts the camera lens by manually turning the focusing ring to make the taken photos clear. This method largely depends on the human eye's judgment of the image on the focusing screen, the photographer's proficiency and even the photographer's vision. Auto-focus: It is a way similar to visual ranging to realize auto-focus. The camera emits an infrared ray (or other rays), determines the distance of the photographed object according to the reflection of the photographed object, and then adjusts the lens combination according to the measurement result to realize automatic focusing. This automatic focusing method is direct, fast, easy to realize and low in cost.