With mounts for Canon, Nikon, Pentax, Sigma and Sony, the Sigma 8-16mm f/4.5-5.6 DC HSM is the widest APS-C optic on the market... It offers a full-frame equivalent focal length of 12-24mm and has a variable maximum aperture of f/4.5-5.6.

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.

Sigma 8-16mm f/4.5-5.6 DC Review

Sigma has embraced the ultra-wide sector, offering 4.5mm, 8mm, 10mm and 15mm prime lenses as well as 10-20mm zooms in variable aperture (f/4-5.6) and fixed aperture (f/3.5) versions and a 12-24mm zoom. There is also this new 8-16mm zoom.

Excellent 8mm performance

Weaker 16mm performance

This lens is a joy to use. I have taken some great photos with it. I have it's big brother, the 12-24 V2 and it is easily as good as that, if not better, but on a Canon crop it is equivalent to 13-26, not 12-24.I still don't understand why people on this forum give poor ratings to what is obviously...

Compact and light; fast to focus; razor sharp; image quality; build quality

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Sigma AF 8-16mm f/4.5-5.6 DC HSM (DX) - Review / Lab Test Report

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.