Slower by one stop, lighter in weight, much lighter in price than Canon’s 16–35mm f/2.8L, but comparably sharp, this lens is a favorite of landscape shooters. Distortion goes to Very Visible barrel at 17mm, though.
This L-series superstar has dust- and moisture-sealed build, and fast and quiet autofocus. The low distortion numbers at the longer focal lengths (0.12%, 0.19% pincushion) promise straight subject lines. Close-focus? An amazing 10.6 inches.