| Sigma 10-20mm f/4-5.6 EX DC HSM Specifications | |
| Frame Coverage | APS-C |
| Lens Construction (groups) | 10 |
| Lens Construction (elements) | 14 |
| No. of Diaphragm Blades | 6 |
| Minimum Aperture | 22 |
| Closest Focusing Distance | 0.24m (9.4") |
| Maximum Magnifcation | 0.15x |
| Filter Diameter | 77mm |
| Maximum Diameter x Length | 83.5mm x 81mm (3.3" x 3.2") |
| Weight | 465g (16.4oz) |
Review Summary
The Sigma 10-20mm gives true wideangle capabilities to APS-C sensor bodies. The lens has very good sharpness with distortion at the wide end being a weakness. Overall it is a good alternative to the Canon 10-22 if price is a factor.
The Sigma 10-20mm gives true wideangle capabilities to APS-C sensor bodies. The lens has very good sharpness with distortion at the wide end being a weakness. Overall it is a good alternative to the Canon 10-22 if price is a factor.
Reviews
Source
Photodo.com
At 15mm it's a little soft at the edges, although still nice in the centre, but by the time it gets down to the 10mm mark the edges have improved again. In fact, at the wide end, the overall performance was the best in the range. The lens has obviously been optimised for the shorter focal length as there was no distortion there, whereas the 20mm end did have a little pin-cushioning.
SLRGear.com
We were pleasantly surprised by how sharp this lens was wide open, across its focal length range. It wasn't perfect, and never got really *crisp*, but on the whole did quite a bit better than we had been expecting. At the 10mm end, the center is very sharp, but the corners get a little soft, but the corner softness decreases substantially as you move toward the "tele" end of its range, or as you stop down even a little from wide open.
Nikonians.org
The Sigma 10-20mm lens has two major strong points: sharpness edge to edge and chromatic aberration. We found that sharpness at 12mm was very good in the center and did not diminish much at all in the image edges, even when shot wide-open. When used wide-open we saw that edge softening began about 240 pixels from the edge of the frame, but this was a very subtle effect.
Popular Photography
If you’re not ready to part with the $720 to $940 that it takes to get a comparable Canon or Nikon zoom, this $500 Sigma digital-only is a contender. What you give up in linear distortion at that ultrawide 10mm setting, you more than get back in superior overall sharpness, well-controlled distortion at the mid and tele settings, superior construction, relatively light weight, and the competitive price.
PhotoZone.de
The Sigma AF 10-20mm f/4-5.6 EX HSM DC is a worthy alternative in the ultra-wide arena for APS-C DSLRs. At 10mm it showed some of the highest resolution figures that we've seen so far here whereas at 14mm and 20mm the results are slightly worse than the rest of the gang but still pretty good. On the down-side the lens shows fairly heavy vignetting at large aperture settings.
