9 out of 10 points and recommendedExtremely sharp from f4 to f11, acceptable at 2,8.Slow AF, build quality a bit poor.
I was worried about image quality at corners on my 5D, but I found them more than sufficient. AF is a bit slow but precise, the keep rate is quite high.reviewed June 7th, 2007
Using it a bit stopped down and not on fast moving subjects will delivery really crisp images.
Quality/Price wise it is a winner! I'm happy I bought it.