Announced at PMA 2009, the Sigma 10-20mm F3.5 EX DC HSM Canon wide-angle zoom lens features a constant f/3.5 maximum aperture (EX) and is equipped with a hypersonic motor (HSM).
This lens was specially designed for APS-C-format cameras. Three of its four aspherical lenses are made of low-dispersion glass elements — specifically, 2 ELD (extraordinary low dispersion) lenses and 1 SLD (special low dispersion) lens.
Its minimum focus distance is 24cm, regardless of focal length, and the maximum reproduction ratio is 1: 6.5.
What we liked:
What we didn’t like:
For this selection, Sigma ends up in second place behind the Nikon with a DxOMark score of 12 points vs 13 points, respectively. (Keep in mind that the Nikon was announced one month after the Sigma.)
As for the Canon, it takes third place on the podium with a DxOMark score of only 9 points. (In fairness, the Canon is more than five years old.)
The Sigma’s strong points compared to its competitors:
The Sigma’s weak points compared to its competitors: