Here’s our concise review of the Sigma 10-20mm f/3.5 EX DC HSM wide-angle zoom lens…
Designed specifically for APS-C cameras, this fixed aperture prime delivers a 35mm equivalent 15-30mm focal length on a 1.5x crop body. It features a solid design, boasting 13 elements in ten groups, and a minimum aperture of f/22. The front element is easily the largest in test, with an 82mm filter diameter, though the construction still manages to keep the weight down to a respectable and manageable 520g.
When shooting at 10mm, it returns very good results, even wide-open, where the centre is sharp. By f/5.6 the corners catch up with the centre and the whole image is impressive. However, at 20mm, this lens really shines. The sharpness is excellent throughout the aperture range and results in pleasing images.
At 10mm the barrel distortion is fairly prevalent, which is common for ultra-wide zoom lenses. However, it can be fixed in post. By the time you reach the 20mm focal length though, the pin-cushioning is very mild, and barely noticeable.
Find out more at the Sigma website.
Sharp at 20mm
Soft at 10mm
Max aperture: f/3.5
Min aperture: f/22
Min focus: 24cm