The fixed-focus lens can focus first and then compose, but now it is out of focus. I'm anxious. What happened? Which expert can answer it? Thank you very much

First of all, in general, twisting the focus ring by hand will not damage the lens.

And then you said the prompt. That sound can be cancelled, which means it can be set to mute in the settings. My own camera is like this, because I feel that the sound is very uncomfortable (because my shooting habit is to nudge the focus many times, and it will be annoying to bring the sound).

Besides, you said focus and focus frame. . . Do you take pictures on the screen?

So you mean that the center is not good for the focus, right? You debug according to what I say below:

1, take off the lens, clean the metal contact, and then install it. Pay attention to screw the bayonet in place and screw the big key of the bayonet lock to play.

2. Select the center focus in the camera settings, that is, focus only at the center of 1 point, without focusing at all XX points.

3. Look at the viewfinder and focus on something at least 2 meters away from you. Whether it rings or not, after focusing, you should see that there should be a solid circle on the rightmost side of the line below the viewfinder. Is it always on instead of flashing? If it's on and doesn't blink, you've successfully focused?

In other words, the success of Focus depends on which position, please understand.

Welcome to ask questions. Please attach a picture below, that is, a picture of the viewfinder. Take a look.

Notice the line under the picture? Different models of cameras may have different focus indication positions. Mine is the position of the red circle below.

You can also read the instructions. This indicator light is available. As long as it is open, it means concentration.