Sigma 100-400mm f/5-6.3 DG OS HSM Contemporary Lens for Canon or Nikon $549 @ B&H Photo w/ Free Shipping

Canon EF
Nikon F
Specs:
Aperture Range: f/5 to f/22
Four SLD Elements
Super Multi-Layer Coating
Hyper Sonic Motor AF System
OS Image Stabilization
Rounded 9-Blade Diaphragm