Excerpt: Tokina's latest version of this classic wide angle optic for Canon or Nikon APS-C format DSLRs sports a fast, smooth autofocus motor in addition to the constant f/4 maximum aperture and costs around £500.
Pros: Excellent sharpness, especially at 12mm, Very good build quality, Fast to focus, Keenly priced
Cons: Chromatic aberrations towards the edges, especially at 12mm, Barrel distortion, especially at 12mm
Conclusion: Image qua lity in terms of overall and edge sharpness is very good, but it is let down by strong chromatic aberration. At 570g this is quite a lump of glass and metal to carry around, but the trade-off is impressive image sharpness. This is no doubt a good l ens, but one that comes with distinct compromises.