The focus wheel can be a bit tricky to get right, especially for first-time users. 

To correctly Focus the AKASO Seemor-200 Night Vision Device:

1. Slowly turn the AKASO Seemor-200 left-hand focus wheel until you get a clear, sharp image.

2. If you start with the lens fully focused out, slowly turn the focus wheel inwards until you get a clear, sharp image.

3. You may need to refocus periodically as lighting conditions change. The ideal focus setting might vary depending on the environment.