The Elmo 9821, also called QT-282AS, is a micro mount lens for the specialty 1/4-inch CCD pencil-sized cameras, namely the QN42H. The lens has a 7 mm screw mount unique at Elmo for these amazingly slim industrial cameras. As a 2.2 mm, the lens shows a 80deg. horizontal angle of view. That's wide angle. Its f/2.8 maximum aperture allow the lens to capture images in semi- low light conditions.