I also bought the Nikon AF-P DX NIKKOR 10-20mm f/4.5-5.6G VR to compare, which runs roughly $100 cheaper. These are both ultra wides. For the money, I found the Sigma superior in quality w/ metal connectors, sturdy body, quality glass and less plastic overall.

This lens is more than I ever expected. The focal lengths are perfect for property photos and a fast lens correction in Lightroom puts everything into place. I love the fixed 3.5 and the 10mm. I have no problems with the SB800 flash providing enough light and coverage.

Consistent Output; Fast / accurate auto-focus; Lightweight

"I love this lens! I recently purchased and used it with my Nikon D5100, and I was awestruck by the results. I'm going to now begin with the comment(s) most people look for: ****** CONS ******.

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.

My first experience with a wide angle lens! Whilst this lens in comparison to a standard zoom affords additional coverage, there are unfortunately, a couple of negatives. At its widest angle there is noticeable fringing / chromatic aberration towards the edges of the image which in most cases can be...

Easy to use; Build quality

Bulky

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

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 have just recently bought this lens and it is fantastic. It is amazingly crisp and works a treat. Highly recommended.

Although I can't compare this to other UWA lenses I can compare it to other zoom lenses I have (such as Sigma 17-70) and this lens beats them hands down. Feel and build quality is excellent. HSM focussing is wonderful. Flare resistance is surprisingly good for a UWA.

Very sharp center; nice feel; good auto focus; very useful range

Corners at 10mm could be sharper

Following in the footsteps of Sigma's full-frame 12-24mm DG zoom, the 10-20mm DC version has a lot to live up to. Fortunately, it is not only equal to the challenge but also pulls ahead in several important respects.

Good all-round performance

Nothing really