DxOMark tested the Tokina AT-X 14-20mm f/2 PRO DX lens ($899) or Nikon F-mount:
DxOMark’s conclusion:
Although the range of focal lengths is somewhat limited, especially when compared with its closest rival, the Sigma 18-35mm (28-45mm equivalent) F1.8, the wider 14-20mm F2 (21-31mm equivalent) Tokina is an entirely different proposition. Indeed, with that f/2 maximum aperture, there really isn’t anything else to compare it with. If the choice of 21 and 24/28mm focal lengths appeal, then the Tokina’s optical performance won’t disappoint.
