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There are many reasons why the lens autofocus is not clear. The main reasons are as follows, which can be checked one by one:

1. During the focusing process, if there is a large moving target in the lens frame (occupying more than 1/3 of the frame), you can refocus;

2. If the lens is used for a long time and transmission parts such as gears and cams are worn, resulting in unclear focus, the module or control panel parameters can be adjusted to make the focus clear again;

3. Hardware problems, such as the potentiometer not working, replace the non-working hardware.

There are many reasons why the lens control board cannot connect to the computer. The main reasons are as follows, which can be checked one by one:

1. Replace the USB port, which may be incompatible with the data cable;

2. Replace the data cable. It may be that the data cable is incompatible with the computer or the data cable is selected incorrectly;

3. Confirm the wiring of the module or control board. The wiring may be loose;

4. There is a hardware problem with the module or control board. Replace the hardware.

There are many reasons why the lens control board cannot connect to the computer. The main reasons are as follows, which can be checked one by one:

1. Replace the USB port, which may be incompatible with the data cable;

2. Replace the data cable. It may be that the data cable is incompatible with the computer or the data cable is selected incorrectly;

3. Confirm the wiring of the module or control board. The wiring may be loose;

4. There is a hardware problem with the module or control board. Replace the hardware.