Negative Positive
Title: Great staple, "go-to" lens.
Review: I have owned this lens for over a year now.The first lens I purchased had severe front focusing issues and was not as sharp as I would like in a lens of this price range. I returned it and the 2nd copy has been perfect. Having spoken with other enthusiasts, this doesn't seem to be an uncommon experience, and Canon may have some quality control issues, which is why this is rated a 4 instead of a 5.The new lens is wonderful, tack sharp, good build and focuses quickly. I use it to do dog photography and it is great outdoors. Indoors for action shots in low light, I would go with the 2.8 over the f/4 to get those really crisp photos in low light conditions. Otherwise great all around zoom lens at a good price. Image stabilization has really come in handy too.
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