I'd been looking to buy a fisheye for my 40D but in general they are just too expensive. On the other end you have the fisheye lens adapters but I don't know how they perform, anyone have any experience with the adapters? Anyway, I saw the Zenitar-m 16mm on ebay so looked at some reviews and on the whole they didn't look too bad. It has no AF and is fully manual...which is cool in an old skool way I guess. I was wondering if anyone has one or has used one and wants to give me their opinion on the lens.