Canon EF 16-35mm f/2.8L II USM

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.

Standout Spec: Three aspheric elements to lower linear distortion.

Canon 16-35mm f/2.8L USM AF

Pentax 16–50mm f/2.8 DA* SDM
Nikon AF-S DX VR Zoom-Nikkor 16–85mm f/3.5–5.6G ED
Sony DT 16-105mm f/3.5-5.6
SIGMA 8–16MM F/4.5–5.6 DC HSM