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Title: It's going back!
Review: I orderd this lens a few days ago and I am not keeping it. Here is my reviewPros:* Solid build quality* Fast and quiet autofocus* Well controlled Barrel Distortion even at 17mm.Cons:* After testing this lens for 2 hours. 95% of the pictures were comming out dark with some indoor pictures having dark corners even with my flash on. Picture taken at 2pm on a bright sunny day were dark and colors were dull!!!*My other L lens EF 70-200 f 4 (from 4 years ago) takes amazing picture compared to this one.ConclusionI think this is quality assurance issue. We are in bad economical times and Canon is getting cheap.Now I have to spend $20 to send it back...I am thinking that I am much better off walking into a store and paying the extra bucks and test the lens before buying it...or get a used one from 4 to 5 years ago. In otherwords treat any lens produced in the last 2 years like a Sigma lens test it before you buy it
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