I have taken two pics of the camera unit, it is a single unit with one lens at the front and the second lens at the back next to the screen. The rear lens is fixed in the housing but the front lens can be moved up and down so you can angle it however you like for both lenses to work properly.

Welshdragon wrote:

Have a look at the link and the last few pictures, shows what happens when tail gate shut a few times did to the camera picture...