Huawei mobile phones can't be seen clearly at close range.

After the release of P40 series mobile phones, there was a new way to take photos and videos for some time. However, some friends complained that Huawei P40pro was slow in focusing and blurred at close range. To this end, we found several reasons for Huawei P40pro's slow focus and blurred close-up photos.

First, the curse of mobile phone shell film

Seeing this reason, I may be a little puzzled. What is the relationship between Huawei P40pro's slow focusing and mobile phone case film? First, explain why the mobile phone case film will affect the slow focus and blurred close-up photos of P40pro, mainly because of the function of TOF camera. Let's take a look at TOF cameras first.

Function and principle of time-of-flight camera

Among the rear cameras of P40 Pro and P40 Pro+ mobile phones, there is a t of camera, which plays an important role, that is, it helps to speed up focusing and optimize the blur effect of large aperture background when taking pictures, all because TOF camera can measure the distance of the measured object.

The reason why Huawei p40pro focuses slowly and the close-up photos are blurred.

When understanding the reason, we must first understand where the light source of TOF camera is. When we aim the battery cover at strong light, we can see the protruding position (decorative layer) of the battery cover where the camera is located. There is a rectangular opening above the TOF camera, which is the corresponding position of the light source of the TOF camera.

Many unqualified protective cases in the market will affect the TOF camera, and there is no opening reserved for the light source position of the TOF camera, which will lead to the inability of the TOF camera to measure the distance, and then the focusing speed will be slow or unable to focus. As shown in the figure below, the phone case will block the light source of TOF camera.

If a film is attached to the back cover of the mobile phone, the light source of TOF camera will reduce the ranging accuracy from 3 meters to 1 meter or even worse because of the insufficient transparency of the film. Specifically, the focusing speed and the precision of background blur will cause the phenomenon of focusing jitter and bellows pulling, that is, the P40pro focuses slowly and the close-up photos are blurred.

There is a rectangular opening under the flash of Huawei P40 mobile phone. Here is the laser focus sensor. In preview, photo, video and other scenes, it can assist focusing, focus quickly and play a better large aperture effect. If the laser focusing sensor is shielded by the protective shell film, it may slow down or fail to focus.

Second, the shooting distance is too close.

P40 series of close-range photos have blurred certificates and ID cards, which makes people feel more like ghost astigmatism. If you have this problem,

Because P40 Pro does not support super macro, the shortest focusing distance of the camera in wide-angle mode is 10cm. If the shooting distance of the text is less than 10cm, it will be out of focus and blur will appear.

You can try to stay away from the shooting text, the shooting distance is about 20 cm, and then switch to 2X shooting, and the shooting text will become clear.

The following are pictures taken by netizens in normal mode, 2X mode and wide-angle mode. The pictures taken in 2X mode are obviously clearer:

P40 supports super macro. When shooting people, it is very clear to use the super macro in the range of 2.5-1 0 cm after zooming in below1times ~