N85 Power Zoom Macro Port 29 ~with 67mm ThreadNauticam optical glass macro ports are finely ground to the highest standard of precision and represent the state of the art in both manufacturing and optical technology. Different size ports are available to support a wide variety of lenses and housing types. Port extensions or adapters may be necessary for some ports and housings. This optical glass macro port is part of the N85 port system and is designed to be used with the 83201 WWL 1 system.