What do the "AF" and "MF" on the camera lens mean?

MF: manual focusing, AF: automatic focusing.

MF: Manual focusing is a way to adjust the camera lens by manually turning the focusing ring to make the 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.

AF: Auto-focusing is the way of camera auto-focusing. Generally refers to the design that the camera measures the distance from a specific area (generally refers to the center, but the current system can specify any corner seen in the observation window), and then adjusts the lens in the lens to form the focus, so that the image in the camera looks clear; Compared with MF manual focusing, AF has become the standard language of modern camera technology.

Focusing refers to adjusting the focal length when using a camera, which is called Focus in English. Generally, digital cameras have various focusing modes, namely, auto focus, manual focus and multiple focus modes.

Focusing is also called aiming light, focusing. The process of changing the distance and the position of the distance through the camera focusing mechanism to make the image of the object clear is focusing.