TINY COSMICAR PENTAX TV HX 3.7mm F1.6 CS MOUNT LENS      . Focus works  ( there is a small fixing screw which can be tightened up , these are so they don`t move when the lens is mounted on a moving CCTV camera etc , you can loosen it with your fingers , easy  . Supplied without caps .  The optics are good , no optical fungus or scratches , and the external cosmetics are good . 3.8cm long when mounted on a camera . Supplied with one bit of cut off cabling ..... I have no idea how the lens works but am guessing it must be wired up to a CCTV camera before you can use it as you cannot see through the lens as it is . Free UK P&P