Wide Angle Plus step up/down recommendations?

[MikeWilkinson]

Heyo–

Looking for suggestions/opinions on a wide angle lens for both the DVX and HVX, with use of a step up or down ring that will allow dual use, without vignetting...

I've seen the 16x9 Inc. lenses that work with both with the adapter ring... any vignetting on those for either the HVX or DVX?

Thanks!