The Sea & Sea DX Macro Port 50 II is a macro-type lens port for an underwater camera housing. Its threaded M67 port end allows you to mount the Close-UP Lens 125 (requires M67-M62 Step Down Ring). It also fits some conversion lenses. This port requires the DX Macro Port Base. Depth rated to 330' (100 m), the port is constructed from corrosion-resistant anodized aluminum alloy and tempered multi-coated glass for protection against impact and the elements.