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.

I bought it for using with Nikon D300S.. quality product with reasonable price..

Easily Interchangeable; Lightweight; Strong Construction

Poor in Low Light

This is an excellent lens for the money. At 10mm (F3.5( it was slightly soft but after 11mm the images were very sharp (F.4 and up). The quality and feel of this lens is really nice. It is a nice fit and nice price for my 7D.

Light lens compared to my 16-35mm; nice color and decent low light performance; nice build quality

Little soft at 10mm but sharpens quickly above 11mm

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...

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

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

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.

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.

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

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.