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Title: Great Lens!
Review: The Sigma 14mm f2.8 is a great lens. It does a good job of keeping line straight. As others have stated you need to stop down (5.6 or higher) to keep sharp focus. That's the case with most very wide angle lenses. It is difficult to focus as others as said. That's just the nature of very wide angle lenses. If you shooting something up close then let the auto-focus do it for you. It you want to make certain it's in focus then measure (the old fashioned way). I've shot numerous projects with this lens and find to be major player in the very wide angle lens field. I've shot home exteriors, home interiors, art gallery interiors and even food with this lens.My only issue with this lens is that it does not handle blowout hot spots well. It tends to shift the color on the fringes of the hot spot to the yellow. You just need to be careful not blowout hot spots which why I gave 4 stars instead of 5 stars.
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