He's using a Sony p-10 camera though - different housing. The adapter will fit the PT-010 (I think that's the housing for the C-4040 and a few others) but not the PT-015 (C-5050 housing)ScubaRon:No that's the digital WAL which I purchased, because I thought the 16mm + converter would not work. But take a look at the pics by Xjae in this thread: I don't see any vignetting.
They're not very sharp, but that is probably the poor visibility or a wrong focus.