Excerpt: This lens is great for capturing a very wide field of view. That makes it highly useful photographing rooms, landscapes or any composition where you want to include a wide scene. I like the fast, constant f3.5 max aperture, and the lens is very well constructed. If you want to know the gritty details,...... It is soft in the corners at 10mm and f3.5, but it improves quickly with increasing focal length and smaller apertures.
Pros: Durable, Easily Interchangeable, Fast / accurate auto-focus, Strong Construction
Excerpt: There are lots of good choices in the ultra-wide angle Nikon DX lens category. I ended up choosing the Sigma 10-20mm f3.5 because it strikes a nice balance between focal length range, optical performance and cost. I was looking for a lens to supplement my Nikon 16-85mm and provide better performance at the wide end. The Sigma does that nicely with low distortion where the lenses overlap (16-20mm).As for the Sigma's performance, I have no complaints..........
Pros: Color Rendition, Construction quality, Good in low light, Sharp
Summary: I've owned this great lens for about eight months, and although it doesn't come out of my bag a lot, when I need or want a VERY wide angle shot the Sigma 10-20mm f/3.5 has no equal. The color and contrast it delivers without any post-production modification is truly amazing. Every image has an eye-catching "snap," even if the subject is very hum-drum.
Excerpt: I scheduled a vacation to the Grand Canyon, Death Valley, and Yellowstone. Needed a wide angle lens for my Canon 40D. Looked at Canon, Tamron, Sigma--liked the Sigma best on paper and price--not disappointed! Beautiful lens with good focus and clarity edge to edge. Used a polarizer (circular) and created mind-numbingly beautiful landscapes! Highly recommended!
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Strong Construction
Summary: I use this lens with our job flipping homes. Taking interior shots requires a wide angle and clean shots. I fall into the "prosumer" category of photography, knowing just enough to be dangerous, so I am sure many experts can find things wrong with the lens...however, for my needs and experience, this lens helps me look like a pro in the real estate photography world.