I should rephrase what I said. It is not useless, it just didn’t do what I wanted it to do. I was hoping I would be able to slap on 16mm lens and get 16mm DOF, but I have since learned it doesn’t work that way. I already own some 35mm adapters, but was hoping to lose the focusing screen. So,in conclusion it’s like Scott said. It will allow you to use better glass, but you won’t get shallower DOF. Scott pointed out some pretty good reading on the matter and it pretty much comes down to sensor size.