Hi Phil & Bob,
Thanks for the input - I have looked at the chart on Nauticam's website - but I would like to only buy one port if possible as I travel with my camera and want to keep it lite as possible not to mention the cost. Since I live in MN there isn't any way to 'rent' and try lens so I am trying to find out what ports others have tried with the two lenses.
Phil is VERY knowable about the Oly & Nauti systems. Please heed his advice.