NEEWER Detachable 180&deg; Fisheye Fish Eye Lens + Back Cover Case For iPhone 4S 4 (Silver) Detachable screw-in fisheye lens for the iPhone 4G/4S. Angle of view: 18?? Versions available for the iPhone 4G/4S. Slim-line protective case fits to the back of the handset; simply screw in the lens whenever you want to use it. The protective case is lightweight, durable and discreet enough to be left attached to the handset permanently, guarding against bumps and scratches.