e less than 1.5 ??m, such as less than 1 ??m, for example less than 0.5??, such as less than 0.25 ??m, for example less than 0.1 ??m, such as less than 0.01 ??m. [0074] The light pattern may be reflected from the surface directly into the camera or into one or more light reflecting means such as mirrors or prisms before ending up in the camera.