They might have.
It might be helpful to have the same measurement as I did in my 3rd shot, above (with my macro lenses), if anyone has the UFL-165AD lens handy.
One thing I don't fully have my brain wrapped around is how these lenses focus. I assume they have to be a very precise distance from the lens (both macro and WA) in order to get a focused shot? Or does the focus mechanism in the camera take care of that, no matter where the lens is placed? (ignoring vignetting issues) *IF* the UFL-165AD fits the Fix 28AD adapter, and focus is not an issue why bother with the 28AD adapter ring? Same deal for my macro lenses, actually.
You know, now that I think about it *smacks head*
my regular dive buddy has the UFL-165AD lens and dives with it all the time. I'll have to grab it from her next time we're out and just see how it compares, from a depth standpoint, and if I can thread it into my housing or not!
Why I didn't tap her shoulder and borrow it for a moment on Saturday, I have no idea.
I could have answered a lot of questions!!!