With all due respect, this IS my problem. I am experiencing exactly these symptoms, just with a different lens. I am fully aware that the Quantaray lens in question was made by Sigma and not by Canon, but after reading this thread I felt I had nothin...
This technique did not work for my Quantaray 28-90mm zoom. I twisted, and pulled as hard as I dared, given the lens' totally plastic construction, but never felt a click. I've got two older Canon bodies, a 3Ti and an SXi, and the lens just makes nois...
