I just finished up making a reverse mount ring for any Canon EOS line. It consists of the lens side of the mount glued to a thread. Now if that was it, then anyone could do it. But there is more. I can retain full electronic lens control. Yes thats right, I wire it to the front of the lens so I can maintain aperture control. I don't have any good pictures of the setup, but I do have pictures of what it can do. Here is a shot with a 28mm at f 2.8. On a normal reverse mount, this would be all you could get. A lousy DOF of less than 1mm. Here is slightly better at f5.6 we can get a 2-3mm But here is my minimum aperture of f 22, with a very good DOF This is almost as good as my homemade projector.