Essai du Tamron 100-400 mm f/4,5-6,3 Di VC USD sur Canon EOS 5D Mark III et EOS 50D par Maciej Latałło pour LensTip.com :Tamron 100-400 mm f/4.5-6.3 Di VC USD review - LensTip.com
Points forts :
- fût de bonne qualité
- excellente qualité d'image au centre quelle que soit la focale utilisée
- très bonne qualité d'image sur les bords du format APS-C
- qualité d'image correcte sur les bords du format 24x36
- pas de problème d'aberration sphérique
- aberration chromatique latérale modérée
- aberration chromatique longitudinal imperceptible
- distorsion modérée
- excellente correction de la coma
- faible astigmatisme
- faible vignetage sur capteur APS-C
- autofocus silencieux, rapide et précis
- stabilisation d'image efficace.
Points faibles :
- vignetage perceptible aux plus longues focales sur capteur 24x36
- un peu trop de flare
et perte de contraste trop visible en contre-jour.
The duel beween the Tamron 100–400 mm f/4.5–6.3 Di VC USD and the Sigma C 100–400 mm f/5–6.3 DG OS HSM was too close to call for most of the time. Their respective levels of performance are so similar that often, in a given category, the winner and the loser were divided by just a hair’s breath, right within the margin of error. What’s more, for the majority of testing categories both lenses were able to compete on equal terms with much more expensive equivalents produced by Canon and Nikon. I suppose it’s the best recommendation for a substitute lens produced by an independent company.
Perhaps the number of small victories scored by the Sigma in different testing categories is higher than the number of the respective victories of the Tamron. The Sigma’s MTFs are slightly bigger, it corrects lateral chromatic aberration and astigmatism in a better way, and its image stabilization unit is more efficient. In the case of spherical aberration, longitudinal chromatic aberration, bokeh, coma, and flares you get a draw. Tamron is slightly better when it comes to distortion correction and vignetting.
So far these two are going almost neck and neck so the autofocus performance and pricing might become two decisive factors. As it happens, in both categories the Tamron prevails. Its focusing mechanism is faster, it works smoothly without any strange wavering we noticed while testing the Sigma. The price tag of the Tamron on the Polish market reaches almost a level of 3000 PLN (about $800) and is by several hundred PLN lower than the price of the Sigma. If you can save such a sum of money while buying a lens which is a tad lighter, faster, with a shorter minimum focusing distance and a longer warranty period you’ll think twice. I suppose most of prospective buyers might decide the Tamron actually fits the bill better.