Ups, Sorry the previous posting is incomplete, here is the entire one....
Hi Jetor,
I have the Oly EM-5MII with 12-40mm Pro in Nauticam housing. So far I use it with the Zen DP-170-N120 port and Nauticam N85-N120 60 mm adapter (as bear35 says there are three versions of the DP-170 port with different connections/extensions, but the N120 hopefully will fit for all the lenses I plan). I acquired the combination recently, not much practice yet, but image quality (at 12mm) is very good.
I also plan to add the WA lenses (so no practical experience with them yet, but I did a lot or recherches already): According to Zen I can use the same port with the Zuiko 7-14mm Pro with the N85-N120 adapter and additional 20mm extension, available from Nauticam.
Phil Burghard from Zen wrote me that for the Zuiko 8mm FE one would need a 30mm N85-N120 adapter that is, however, not available by Nauticam.
There is a company in Vienna http://www.unterwasserkamera.at/ run by Manfred Werner. Werner not only sells underwater camera equipment, but also produces coustom made extension rings and adapters for reasonable money. He will produce a 30mm adapter for me for use with the 8mm FE. I will report as soon as I have made some fotos, but I will take still some weeks more until the adaptor is ready...
Another note: already at 12mm I noticed that it can be difficult to get close to an object, e.g. fish portrait, with the 170 dome. So the DP100 port will certainly be more convenient for use with the 8 mm fisheye, when closely approaching an object. I do not know, however, how the image quality would be in comparison...
Wolfgang