How to improve the definition of the camera?

1. All the pictures are blurred.

2. Or is it sometimes clear and sometimes vague?

3. Or, you can see it clearly, but it will be blurred after zooming in. Do you want to strengthen it?

If it is 1, it may be. ...

A. Your focusing function is faulty or improperly adjusted (adjusting the focal length or the distance between the camera and the subject can be improved).

B or the environment is not bright enough (it can be improved by turning on the light or shooting in a bright place).

C. Or the lens is dirty (just dip it in water or wipe it with pure alcohol with a non-woven fabric that won't lose cotton wool)

If it is 2, it may be ...

A. 1.a ditto

B. 1.b ditto

C. or sometimes you are too close to the subject.

If it is 3, it is very difficult, because the resolution of the camera is fixed and cannot be changed. If you want to have better resolution, you must change to a higher pixel camera.