To watch the video tutorial, please click here. Center Cam has an interchangeable external lens, similar to a DSLR camera. Sometimes the lens shifts during shipping. First, plug in camera and open a video window so you actively see focus of Center Cam. Unscrew the inner nut. Rotate lens slowly clockwise 1/4 turn, monitoring focus. If focus becomes MORE blurry after 1/4 rotation, rotate counterclockwise slowly 1/2 full turn until camera comes into desired focus. Re-secure with lock nut.