The SharpEye Lens M55 is an accessory macro lens which fits over the housing lens port and can be installed and removed during the course of the dive. It is perfect for shooting close-up images of fish, corals, textures and more. The macro lens magnifies the subject and enables the camera to focus on short distances for creating super sharp images. It can be mounted on 55mm threaded lens ports or any other lens port by using a compatible adaptor. The Lens is construction from a single aspherical element has a hard coating & AR coating with the barrel constructed from aluminum with a black anodize finish. This corrosion resistant lens weighs 0.92oz (26g) measures 2.36" x 0.4" (60mm x 10mm) with a focal length of 13" (333mm) underwater. The lens is depth rated to 200' (60 meters). The Fantasea SharpEye Lens comes with an instruction sheet and is covered by a 12 month limited warranty.