Three ring diameters are designed for use with many different underwater cameras and housings in addition to all Epoque underwater products. The 46mm ring is threaded for use with Olympus housings, the 55mm size is for most Epoque and other brand underwater housings, and the 67mm lens is for use specifically with the Epoque EHS-1000 HD Video Housing. The rings are interchangable and can be purchased individually in all sizes at nominal prices. This allows one lens to be mounted on more than one camera or housing with different threaded ring sizes. The multi-lens adapter ring can be mounted on most underwater cameras and housings with a tripod socket, and positioned so that the DML-2 macro lens is directly in front of the camera's primary lens. This allows cameras and housings that do not have a threaded port to use the underwater macro lens for super magnification of subjects.