It does work, but wouldn't it be much easier to shoot with a DSLR camera like a Nikon or Canon? By the time you add the housing, the strobes and focusing lights it would seem that the smaller size advantages of the NEX7 camera have been all but eliminated. And you've lost the DSLR advantages of thru-the-lens viewing, auto-focus, true macro lenses and reliable TTL underwater flash.
Jason down sized from a D7000. Thats why he's shooting the NEX. He can get it all in 1 carry bag!
Are these from Blue Herron in early Dec during the macro course?
Hope all is well.