Why are the photos taken by the camera clear in the middle and blurry in the periphery?

The coms is dirty. The dust can only be seen clearly under a small aperture, which has nothing to do with the image clarity. In fact, you said that the middle is clear and the surroundings are blurry because your photo has a large depth of field. The aperture you adjusted may be relatively large, so the depth of field is small, resulting in mismatch. (Depth of field refers to the distance range of objects measured by the camera lens along the axis of the imaging depth-of-field camera that can obtain clear images.) When taking pictures of landscapes, group photos, etc., use a small aperture (large aperture value). If you want to highlight the subject, such as taking a portrait, you should use a large aperture (a small aperture value). Too wide an aperture will cause vignetting.

If you set the automatic mode, it will become macro and auto focus. Blurry around and clear in the middle is the effect of autofocus.

2.

If the autofocus is not turned off, there is a frame on the screen indicating autofocus or face recognition. To turn it off, switch to manual mode or landscape mode.

3.

Switch to manual mode, press menu, there will be many options, press up, down, left and right to select.

1. First of all, I must say that the Leica camera has sharp images and clear night shots. 2. There is no problem with the battery being used heavily for a day, provided that you know how to set it up when using the phone, disable some useless background programs and set up the auto-start option. 3. Although the appearance has no special features, the entire body of the 5.9 screen is about the same size as the 5.5 screen. It is better for adult men to use, but it is not suitable for women to use. 4. It is indeed fast enough, and it is also fast when running multiple software in the background. 5. The headphones used for listening to music and watching movies are not much different from other models, but the external sound effect is good. With the 5.9 large screen, it becomes a portable theater. 6. The screen brightness is sufficient, and the phone can be viewed clearly under the sun. 7. Fingerprint recognition is fast and lights up (screen) with one touch. 7. The call is clear. 8. Both mobile data connection and WIFI connection are very fast and the signal is very strong (this is more important to me).

The phone has not been dropped since I bought it and is used normally. I don't understand why this problem occurs, and I never noticed it before.