The Elmo 9812, also called QT254, is an ultra-micro-mount lens for the specialty 1/4-inch CCD pencil-sized cameras, namely the QN42H. The lens has a 7mm screw mount unique at Elmo for these amazingly slim industrial cameras. As a 4.0 mm, the lens shows a 48deg. horizontal angle of view. Its f/2.5 maximum aperture allows the lens to capture images in semi-low light conditions.