Alien,
Shot with the Sigma 60 & 26mm extension tubes a little bit in Puerto Galera last month. Got some decent shots but the limited focus range is a bit of a bear to deal with in terms of subject matter. I ended up using my 18-55 more because I didn't want to miss shots outside the short focus range. I tried to load a few small jpegs shot with it, but the photo upload failed for some reason?
B&H says the Zeiss 50mm e-mount macro will be out next week on April 28th. I think that is fairly accurate, as it's now listed on eBay coming out of Japan, so we know it's in production. We should see it soon here in the US and perhaps Europe too.
Roger Cicala at
LensRentals.com - Rent Lenses and Cameras from Canon, Nikon, Olympus, Sony, Leica, and more who publishes lens tear downs, including some of Zeiss e-mounts, said it may be possible to remove the 3mm filter/hood holder so the lens fits Port 72, but he won't know until his company has one in stock. If not, I suspect a 20mm mini-port extension will work fairly well if one wants to keep using Port 72, especially if they have the expensive 67mm swing mount.
I'm return back to the states next month and it will be a while, maybe close to a year, before I go diving again, so no hurry here since it won't be in my NA-NEX7 housing anytime soon. The new ZEN macro system looks promising with it's use of both the Canon 60 and 100mm macro, so I've got time to wait and see how things pan out with the Z50.
You should have your complete NEX system soon. Looking forward to seeing something out of the Zeiss 12 and 50mm work out for you.
Happy diving.
Marsh