I found this at Goodwill for $10. It's a Sony VCL-ES06 0.6 wide angle adapter, probably made for a camcorder. It has 37mm threads and fits on the end of an Oly 14-42 just fine, and autofocuses with no problem. The big advantage is the front is about 70mm wide and it has no vignetting. The whole thing is about an inch and a half thick, and it has a snap-on mount that doubles as a short lens hood. I'll post pictures of it later, and a sample photo too.