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Get information and user reviews for this lens from Amazon: Sigma MACRO 70mm f/2.8 EX DG Autofocus Lens for Canon EOS
The Sigma AF 70mm f/2.8 EX DG macro is capable to deliver exceptionally sharp results throughout most of the aperture range. The bokeh (out-of-focus blur) is very smooth and buttery. Typical for macro lenses it also produces a negligible degree of distortions. On an APS-C DSLR vignetting is nothing to worry about. Lateral CAs (color shadows at the image borders) are comparatively high for a fix-focal lens but still fairly low in absolute terms and not really field relevant. The AF performance of the lens isn’t overly impressive – the accuracy is fine but it is both slow and noisy. Other than that the build quality is on a very high level. READ FULL REVIEW
Other Sigma 70mm f/2.8 EX DG Macro AF Review
By any measure, the Sigma 70mm f/2.8 is a superb macro lens, offering exceptional optical performance and good build quality at an excellent price. It outperforms anything in its price/focal length bracket by anything from a narrow to a wide margin, and represents one of the best bargains in a high-quality, medium focal length macro lens on the market today. Highly recommended! READ FULL REVIEW