I bought it instead of Sigma 10-20/4.5-5.6 with good discount price. For such price very good wide zoom lens for crop cameras. When buy try to check a few copied due bad Sigma quality control. My copy is really perfect. For higher price check Tokina 11-16/2.8, but for me zoom range is not enough

Fast and accurate focus; Sharp in center even open at 3.5 at 10 mm; Very reasonable sharpness in corners after 7.1; Overall picture quality better compared to Sigma 10-20/4.5-5.6 and Sony 11-18/4.5-5.6

Some CA at 3.5 in corners; No after 4.5; Could be less distortion in corners at 10-12 mm

Sigma's original 10-20mm f/4-5.6 ticked pretty much all the right boxes, and rapidly became a top seller for users of Canon, Nikon, Olympus, Pentax, Sigma and Sony bodies alike.

Great lens, compares very favorably to my Canon 17-40 that cost much more. The set 3.5 is great! There is very little distortion (bulging/curving) and good sharpness even at edges. As long as you keep the camera level, all verticals remain straight.

I was lacking a wide angle, Im no pro. I went with sigma as its cheaper than Canon and has a great reputation. I really like the fixed apature and the fact that it has a super warranty, hood and case. This very quickly became my "walking around lens" just because it is so versatile and fun to use.

Beach Camera did a GREAT job in getting it to me QUICK!!! Thanks!

Fast / accurate auto-focus; Strong Construction; Durable; Lightweight; Rugged; Consistent Output; Easily Interchangeable

The build quality of the lens is excellent. It features the crinkle style finish typical for Sigma EX lenses, both zoom and focus ring are damped, the latter a little stiff, though.

I'veused this lens for over a year, and have loved it. I have made the transition to full frame now so this lens will stay with my crop body as backup and will be sorely missed

Great for croped bodies; amazing range at widest setting; reasonably fast FIXED aperturehandles distorion well; while allowing distorion effects when you want them

Flares can happen with this lens; filter size is large; and expensive at 82mm but a must for landscapes.

I bought this lens specifically over the Sigma 8-16 because I needed it to accept 80A filters and have a constant f3.5 aperture because I do a lot of both low light handheld and tripod night shooting.

constant f3.5; accepts filters

though the center is sharp at all focal lengths and apertures it is almost useless at 10-12mm due to poor edge sharpness and very high lateral color starting about 30% out from the center

A wide-angle zoom is definitely the way to go when photographing in this type of situation, whether it's a car show, antique show, or anywhere that's crowded or the subject is large, such as architecture.

Quality; true cost of lens; construction

Distortion at widest angles

The well-built Sigma 10-20mm f/3.5 EX DC HSM Lens, at review time, is one of only a few lenses in the ultra-wide angle APS-C lens class to have a fixed maximum aperture. While f/3.5 is not what I typically consider wide/fast, the fixed maximum aperture allows a constant wide open aperture exposure...