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That's a situation where one of these makes great sense. I'm assuming AF isn't impacted at all (the camera shouldn't have any issues, though I'd imagine using IS is out due to the inability to set the correct focal length). How's sharpness? The web reduction looks good, but it's hard to tell from that.
AF doesn't suffer, but MFD becomes quite long, about 15/20 feet, I guess; sharpness is really good, even in the corners if you stop down a little; the major issue seems to be CA, but I guess that LR would fix it.
As soon as I get the adapter ring I'll be able to show some more eloquent samples