N85 to N100 65mm Port AdapterAn adapter to convert from an N85 port opening to N100 port opening to use with N85 Port System housings. The extension also has an integrated zoom gear knob. See Port Chart for more details on choosing the correct extension and port. Technical Specifications Depth Rating 100m Port System N85 to N100 Conversion Weight Port Opening Diameter Port Diameter Body Material Anodized Aluminum Alloy Port Material Port Coating Port Shade Material Removable Port