Why is the camera's image unclear???

Why is the camera's image unclear???

Many of us faces that problem of having blurry photos like this one above, below are possible reasons and solutions : 

• Unmatched lens mount

There are two types of lens mount for box cameras,respectively are CS mount and C mount, the lens and camera must be matched with the same type.

• Use Focus in / focus out to control the Clarity.

• Check whether the lens or housing gets dirty.

• In case of strong light condition, please select electronic iris as the lens type.

Here you are some examples of Blurry images :