This is simply a great lens that every Canon SLR/DSLR owner should own one. I own two of this lens, not because one broke or out of order, but simply because I really can't live without this lens, so I need to have one back up. I use this lens on my Film SLR and Digital SLR. The results are just stunning, sharp and vivid. I never have any problem with the focus; it is fast and quiet even under low light situation. One problem that bothers me is the Chromatic Aberrations. Under normal lighting, Chromatic Aberrations is hardly visible,but once you are in a back lite situation, Chromatic Aberration become very disturbing, though you can still able to reduce it to an extend. Other than the Chromatic Aberrations, everything is pretty good. Highly recommended. By the way, I had used this lens for more than 5 years.
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