Reviews and Problems with Sigma 24-70mm F2.8 EX DG HSM
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Sigma 24-70mm f/2.8 EX DG HSM review
18 November 2010
Summary: Summing this lens up in a paragraph or two is actually quite difficult, as it's almost like I've tested two completely different lenses at once. The first one being an f/2.8 zoom lens, which should be great for low light photography, but unfortunately falls slightly below par in terms of...
Pros: Excellent optical performance stopped down to f/4 and below, Good build quality, Fast autofocus
Cons: Resolution at maximum aperture at focal lengths beyond 35mm, Barrel Distortion at 24mm
Sigma AF 24-70mm f/2.8 EX DG HSM - Full Format Review / Test Report
14 September 2009
Conclusion: Based on its sheer specs the Sigma 24-70/2.8 EX DG HSM is a very attractive lens. It promises professional grade results at a more attractive price point. It terms of mechanical build quality it is certainly up there with the best in its class with the exception of weather sealing maybe.
Sigma AF 24-70mm f/2.8 EX DG HSM (DX) - Review / Test Report
11 September 2009
Conclusion: Center and border sharpness is generally very good, but there's a visible drop in sharpness wide open and the extreme corners need smaller apertures to show good resolution. Vignetting and CAs are very low and not really field relevant, except maybe CAs at 24 mm.
Sigma AF 24-70mm f/2.8 EX DG HSM (FX) - Review / Test Report
9 September 2009
Conclusion: Shot wide open, the lens shows considerably less resolution in the center and very disappointing border performance. In addition, vignetting is rather high, at 24mm even stopped down and the bokeh at all focal lengths is rather unpleasing.