Sigma 120-300mm f2.8 EX DG OS HSM S Canon and Nikon mount lens review: Prime image quality in a zoom?By Kevin Carter - Friday October 25 2013 Lens Review
Sigma 120-300mm F2.8 DG OS HSM S Nikon Versus Tamron SP 70-200mm F/2.8 Di VC USD Nikon:
One of the best telephoto zooms for Nikon FX:
Measured against the Nikon mount Tamron, the Sigma compares favorably. Like the Canon mount version, the Tamron loses out at the longer end, though the D800 sensor manages to extract a little more sharpness wide open at 200mm from it than the Sigma at the same setting. All the same, the Sigma has lower distortion and vignetting and even has better control of chromatic aberration at the longer focal lengths, though the reverse is true beneath 200mm.
Sigma 120-300mm F2.8 DG OS HSM S Nikon Versus Nikon AF-S Nikkor 200mm f/2G ED VR II Versus Nikon AF-S NIKKOR 300mm f/2.8G ED VR II all three mounted on Nikon D800
We were curious to see how well the Sigma stacked up against the outstanding Nikon AF-S 200mm f2.0 (we haven’t yet seen the Canon equivalent). Unsurprisingly, both the 200mm f2.0 and 300mm f2.8 are noticeably sharper, and, from f2.8 down, have lower distortion, vignetting and CA. While that is disappointing, with such a good overall performance the Sigma may well remain in contention.