Sigma 10-20mm F4-5.6 EX DC HSM Pro Reviews

Some lack of critical sharpness, particularly in the corners, combined with poor control of chromatic aberration has let down what could be a great optic for the price.

The bottom line seems to be that the Sigma 10-20mm f/4-5.6 EX DC HSM is a real bargain for an ultrawide zoom for sub-frame cameras. If you want to shoot really wide with your DSLR, this lens looks like a good way to go about it.

The 10-20mm F4-5.6 EX DC HSM is Sigma's offering in the APS-C ultrawide zoom sector, first announced in February 2005. It was introduced amongst a flurry of announcements as manufacturers raced to provide wideangle zooms for the burgeoning APS-C format DSLR market, with similar offerings also appearing in short measure from the likes of Tamron and Tokina (not to mention all of the major camera companies). It has since become a very popular lens, due in no small part to offering the joint-widest angle of view of all the APS-C ultra-wide zooms, while being available in mounts to fit all of the major DSLR systems. Equally it's not hurt by having a very competitive price; it's notably much cheaper than the camera manufacturers' own offerings in this sector.