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 :