9 out of 10 points and recommendedQuality ProductBack focus
Answering to the last review, I must say that I am not agree with the coments. My copy that now is in Canon service has a real back-focus. Shoting two images at 1.2 wit AF or in Manual focusing (tripod and mirror blocked, etc..), the diference of quality image is increible, the back focus is visible for any person and at 1.2 the diagrag remains witout movement. For this reason the problem is obvious this lens has a real back-focus. The question is, It returs the objective with the problem resolved? I hope that.reviewed December 6th, 2007
PD: After the Canon calibration, the lens turned to EXCELENT.