Compare Tamron SP 150-600mm f 5-6.3 Di VC USD G2 for Nikon F vs Nikon AF-S NIKKOR 500mm f 5.6E PF ED VR Lens vs Sigma 150-600mm f 5-6.3 DG OS HSM Contemporary Lens for Nikon F vs Nikon AF-S NIKKOR 200-500mm f 5.6E ED VR Lens