N85 to N120 47mm Port Adapter ~with Knob for M4/3 SystemAn adapter to convert from an N85 port opening to N120 port opening to allow the use of N120 ports on N85 housings for Micro Four Thirds Camera systems. 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 N120 Conversion Weight Port Opening Diameter Port Diameter Body Material Anodized Aluminum Alloy Port Material