Nauticam's website has a port chart saying what ports go with what lenses. For the 6" it lists the pana 7-14 and 12-35. For me, the system bottleneck is me, and while the 7-14 i'm sure is better than the 9-18, I'm really not skilled enough to take advantage of it. I'm having a hard enough time framing, composing and lighting with the 9-18 and I don't think going wider is the fix. Right now I have the OMD and Nauticam, 60mm macro, 9-18, with their respective ports. For the wide angle, I end up shooting a lot of video.