Ikelite INON Dome Lens Unit II for UWL-H100 is an accessory for underwater photography that can be attached to an INON UWL-H100 series lens. It enables the user to take wider images and get closer to the subject. The Dome Lens Unit II functions as a Semi-Fisheye Converter when attached to an INON UWL-H100 series wide conversion lens. It increases the underwater angle of view to close to that of the UWL-H100 when used in air. The special optical design not only enables a wider angle of view, but also allows closer focusing distances for ultra-wide macro imaging.