Nauticam Macro port 65 for olympus M-ZuikoThis Macro Port 65 is designed for housings supporting the N85 Port System. The front of the port has integrated 67mm threads for accessories. Technical Specifications Depth Rating 100m Port System N85 Weight Port Opening Diameter Port Diameter Body Material Anodized Aluminum Alloy Port Material Optical Glass Port Coating Port Shade Material Removable Port Shade Spare O ring 90143