Designed for full-frame bodies, Tokina's fast, wide zoom has full-time manual focus and uses super-low dispersion glass.
Standout Spec: Price. It's a deal for glass this fast and wide.
Nikon AF-S Zoom-Nikkor 16-35 F4G ED VR
SIGMA 8–16MM F/4.5–5.6 DC HSM
Nikon AF-S DX VR Zoom-Nikkor 16–85mm f/3.5–5.6G ED
Canon EF 16-35mm f/2.8L II USM