Wide angle lens selection and accessories for new Sony setup

Yes pretty much set the lens up before the dive. I enjoy using lenses which have a certain look to them and since we are all on a budget I found myself wondering if this ultra-wide (weitwinkel) lens from Voigtländer would work. I find the dome port guides of housing manufacturers rather limited and since I wanted to buy this lens for general use, the question was does it work underwater. Answer apparently yes, but with added cost/time for the gears to operate aperture and focus.