This lens is physically about the same size and weight as the canon 17-40L lens. They have similar central sharpness at f4.0 but the sigma corners are fairly soft, and no way as crisp as those on the canon 17-40L lens. There is little vignetting at f4.0 on the sigma, but the vignetting at f 1.8 is fairly marked.
I am not sure of the best use of this unique lens. I bought it for nighttime photography of the constellations as a poor man's version of the very expensive canon 16-35L lens, but it may prove to be to soft for this. I will have to try it some. It does focus quite closely, and the large focusing ring is pleasant to use. For people travel photography, with a diffuse blurred background, such as from photographer Phil Borges, this may be quite a useful lens. It's is a fast lens, but you have to really just want the center to be sharp, as for landscape photography it will be too soft and the 17-40L lens will be much better.Get more detail about Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Lens for Canon Digital SLR Cameras.
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