Oui sans problème
Un test fait par Popular Photography : http://www.tamron.com/lenses/prod/ [...] t17-50.pdf
« IN THE LAB: SQF testing showed Excel-lent sharpness and contrast at three tested focal lengths—while good, the numbers are about average by today’s standards.
But, distortion control is clearly superior, especially at the wide end. At 17mm, DxO Analyzer 2.0 tests showed only Visible barrel distortion (0.42%)—a significant improvement over Tamron’s comparable 17–35mm f/2.8–4 zoom, which has Very Visible barrel distortion at 17mm (2.1%). The longer focal lengths also earn well-above-average numbers: At 24mm, we found virtually no distortion (0.06% or Imperceptible pincushion) and, at 50mm, only Slight pincushion (0.14%). Bravo, Tamron.
With no detectable light falloff in the corners by f/5.6 at 17mm, or by f/4 at the longer focal lengths, the lens’ vignetting characteristics are also commendable. »
Message édité par Profil supprimé le 19-01-2008 à 21:51:23