-Model: UWL-09PRO -Description: Underwater Wide Angle Conversion Lens -Lens Construction: 6 Elements in 6 Groups -Lens Coating: All Glass Lens Elements with Multi-layers AR Coating, Optical Grade Glass Dome Lens with Inner Surface Multi-layers AR Coating -Field of View (diagonal): 130°(with 28mm Lens) -Magnification: 0.45XMinimum -Object Distant: 0 mm to the Front Dome Lens -Mount System: M67 Thread -Depth Rating: 100 Meters / 330 Ft. -Weight (on land / underwater): 1408g (on land), 770g (underwater) -Dimensions: 139mm (D) X99mm (H)