Sigma 8-16mm f/4.5-5.6 DC HSM lens

The Sigma 8–16mm lens is an enthusiast-level, ultra wide-angle rectilinear zoom lens made by Sigma Corporation specifically for use with APS-C small format digital SLRs. It is the first ultrawide rectilinear (non-fisheye lens) zoom lens with a minimum focal length of 8 mm, designed specifically for APS-C size image sensors.

Source: Wikipedia — Sigma 8-16mm f/4.5-5.6 DC HSM lens (CC BY-SA 4.0)