Prevent unwanted reflections from showing up in your images with this Olympus POSR-EP08 46mm Underwater Shading Ring for lenses with 46mm thread diameters, such as the M.Zuiko 17mm f/1.8 and 12mm f/2.0. It is designed for use in a compatible lens port on an underwater camera housing. The ring blocks the writing on the lens, such as aperture and focal length information, from being reflected in the glass of the port and showing up in your photos and videos.