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Photo Zone
Generally the Sigma AF 18-50mm f/2.8 DC EX macro delivered a solid performance but without being any better than the competition. The resolution results are generally very fine except at 18mm where the extreme border performance leaves something to be desired below f/5.6. Distortions as well as CAs are about in line with the rest of the gang. Typical for most dedicated APS-C lenses the vignetting could be a little better at wide-open aperture. The build quality and handling of the Sigma is fine. The Sigma offers lots of bangs for your bucks but the comparable Tamron AF 17-50mm f/2.8 SP seems to be a better alternative. “¦ READ FULL REVIEW
Other Sigma 18-50mm f/2.8 DC EX macro AF Reviews
Photo Zone (Canon Mount Tested)
The Sigma AF 18-50mm f/2.8 EX DC is an interesting alternative to the basic kit zooms – a higher quality one that is. The performance is generally very good especially in the center of the image. For edge to edge sharpness you may prefer to stop down a little specifically at 18mm where the extreme corners are soft at wide-open aperture. Chromatic aberrations can be disturbing if not corrected and purple fringing can be a quite significant problem at large aperture setting as well (not completely correctable). Typical for many standard zooms the barrel distortions at the wide-end are very pronounced though the issue fades rapidly with longer settings. The build quality is very decent and maybe a little better than other lenses in this price class and zoom range. All-in-all the 18-50mm f/2.8EX is not a lens without flaws but the package is quite sound especially when considering the large max. aperture, the price as well as the competition.”¦ READ FULL REVIEW