What is focusing and what is focusing?

Focusing is defined as, for example, putting a convex lens in the sun, the lens will form a light spot. The process of properly adjusting the distance between the lens and photoelectric illumination to minimize the light spot is called focusing. The point is that this involves the camera! There are several kinds of focusing. One is 1 manual focusing: manually turn the focusing ring to make the photos clearer. 2 Multi-focus: the setting of focus and position' is convenient for taking different pictures' 3 Holographic autofocus: advanced laser holographic photography technology' laser spot automatically detects the edge of the subject. There is also the ability to focus easily when shooting in the dark.