What do the AF and MF of the camera mean?

AF stands for auto focus and MF stands for manual focus.

Auto-focusing refers to: using the principle of object light reflection, the reflected light is received by the sensor CCD on the camera and driven by the computer to focus, which is called auto-focusing.

MF means: it refers to the focus mode that can realize clear focus by rotating the lens focus ring or stepping by pressing the body direction key. Manual focusing in the digital camera era is generally used when autofocus fails, which is a powerful supplement to autofocus and is still an indispensable function in the digital age.

Extended data

Manual focusing in the era of digital cameras is used when autofocus is wrong.

Specifically, it is necessary to use manual focusing when the scene contrast is small, the background contrast of the subject is too large, the ambient brightness is low, the ambient brightness is too high, there is interference from high-brightness light sources, it is necessary to shoot through transparent obstacles such as glass, and the subject is outside the focus area. A camera with live view function can easily use manual focusing with magnification of 2 times or 4 times to achieve precise focusing without excellent vision.

From the basic principle, autofocus can be divided into two categories: one is ranging autofocus based on the measurement of the distance between the lens and the object being photographed, and the other is focusing detection autofocus based on clear imaging on the focusing screen.

Baidu encyclopedia-autofocus

Baidu Encyclopedia-Manual Focus