This is my favourite lens without a shadow of a doubt. It's superb for landscapes and producing amazingly artistic photos from all manner of subjects. It's sharp as a knife and tough too.

Very hard to correct chromatic aberrations, strange colors. Sharp. Tried on Canon 80d and returned after a couple of days. ( real estate photographer)

The Sigma 8-16mm F4.5-5.6 DC HSM is the only one of its kind. This is the first ultra wide zoom lens with a minimum focal length of 8mm, designed specifically for APS-C size image sensors.

Their latest addition (as of the time of this review) is the Sigma AF 8-16mm f/4.5-5.6 DC HSM. Besides being the most extreme rectilinear ultra-wide lens on the market it is also the first one to sport Sigma's latest new innovation - FLD glass elements.

This lens did give me good, sharp images- once I figured it out. I bought this primarily for real estate interiors and urbex photography. One of the very first things I noticed about this lens, was it gave dark images.