When it works, it's great, but...
Excellent lens, when it works. The problem is I can't tell when it's going to work, and when it's not. It's almost moody. I stuck with Canon, and got 2 new lenses to replace it. Keeping it as a possible backup. I would not recommend it, especially at that price.
May 12, 2014
Err01 - Defect in design - BAD NEWS
Hardly used this lens but it died because of a defect with the ribbon cable in the lens. Error message - Err01
April 10, 2014
Took 11, 000 pictures with this lens, then suddenly it had a communications failure with t3i. this is a known defect with this lens -- i.e., the flexible cable inside the lens that does the electronic communication wears out and fails. The lens then stops working completely. The lens was bought in 2012 and failed after 18 months (out of warranty of course).
That it failed on a trip to an african country was very disconcerting. Fortunately I had an EF 35mm 4L, an EFS 10-22mm, and an EF 70-200 mm 4L with me.
Will probably either get it fixed (have Canon replace the cable) or buy an EF 24-70mm 4L for a more dependable lens...having a lens fail on a trip is untenable. Such a product with a known defect-- particularly given the fact this lens was bought 4 years after it was introduced by Canon just shouldn't happen!! The defect should have been corrected within 2 years of its introduction.
January 3, 2014
Poor quality and poor performance
The autofocus failed during a trip at the Everglades, I had to work on manual mode all the time. The repair is a very difficult task and costly. I has the lens for over two years, Canon should stop advertising this lens.
December 24, 2013