How good does the Sigma 17-40mm F1.8 make APS-C look?
When you use DPReview links to buy products, the site may earn a commission. Sigma 17-40mm F1. 8 DC Art @ 28mm | F1. 8 | 1/5000 sec | ISO 125 Photo: Richard Butler Sigma's 17-40mm F1. dpreview.com »