Sigma 15-30mm f/3.5-4.5 EX DG

Manufacturer's Description:

"A super wide-angle zoom covering from 15mm ultra-wide angle to 30mm wide-angle

Sigma provides the new ultra-wide angle zoom lens from 15mm and this lens is the first of its kind in the world. It can be useful for images of landscapes, large buildings, group photographs or even more. The perspective that changes with the angle-of-view gives picture an extraordinary feeling."