How does Xiaomi 5s achieve manual focusing and autofocus?

Xiaomi mobile phone generally defaults to autofocus. If you find yourself out of focus when taking a picture, just press the screen with your finger and a box will appear, indicating that you are in focus.

Auto focus and manual focus.

Let's first understand the difference between MF on the lens and M-file shooting mode on the fuselage.

Setting the lens to MF is a manual focus mode. If you want to focus clearly, you must turn the focusing ring manually. There are three corresponding autofocus modes AF (single point, smart, servo), and the 60D has nine autofocus points, which can be all started or one of them can be selected.

The m range on the fuselage is the shooting mode, which means that the exposure parameters (shutter, aperture, ISO) should be determined manually.

Therefore, manual exposure parameters and manual focusing are completely different. For example, in the range of m, one of AF or MF can be selected to cooperate; For another example, under the AV file, you can choose AF or MF. Only when the two cooperate well can a good film be made. M exposure combination depends on experience, MF precise focusing depends on eyes (of course, in real-time display shooting mode, 10 magnification precise focusing is not a big test for eyes, but it needs to be put on shelves).

2. Is manual focusing better or automatic focusing better?

Manual focusing has at least two advantages: first, it is not bound by nine autofocus points. You can use your eyes to select any part you want to focus on in the viewfinder and focus on the place you think is the clearest. The shooting mode of real-time display is also set to M file, and any focusing part can be selected in the full screen. Second, it is generally believed that manual focusing is the most accurate.

For example, it is reported that when shooting a portrait, you can focus on the composition without being limited by the autofocus point by selecting MF under the AV file. However, it seems that people with myopia and bad eyes like me are more difficult to operate. The other is an example of manual focusing in real-time display shooting mode. Some data show that this technology is very powerful, and everyone can shoot clear and sharp landscape films. It is out of the question. Clarity is possible, but it doesn't mean that clarity is good.

Let's talk about autofocus mode again. With the rapid development of digital SLR technology, the automatic focusing technology of machines is becoming more and more powerful. For example, for 60 days, the central focus is the double cross focus of F2.8 and above, and the other 8 points are also the cross focus, which is really powerful. However, according to the data, the principles and functions of the two crosses on the central focus are different. The so-called positive cross focusing, including 8 in the center and around, corresponds to F5.6, which is characterized by fast focusing; The "oblique cross" superimposed on the central focus (called oblique cross for the time being) corresponds to the aperture of F2.8 and larger, which is characterized by high accuracy. So the central focus is not simple, it is fast and accurate. 7D or higher-end machines have more autofocus points, and in short, they are more and more powerful.

For the average person, autofocus may be used more than manual focusing. Some people will use manual focusing in order to pursue better focusing quality with the improvement of their ability and experience.