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Un heureux possesseur de cette optique pourrait-il nous donner ses impressions ? Je suis très intéressé par la version Sony, mais je lis ici et là que l'AF est bruyant, notamment en AFC ?
pour info, un exemplaire neuf à 275€ chez images photo nimes, idem pour le 24 mm.
Je me serais bien pris le Sony 20mm f1.8, mais pour l'usage que j'en fais... C'est aussi pour compléter en paysage le 28-75 histoire d'avoir un plus grand angle pas trop lourd en montagne. Plus large, j'ai rarement besoin.
The Tamron 20mm f/2.8 Di III OSD M1:2 is a bit of a complicated being. Obviously, it's not meant to be used without image auto-correction. Especially the massive (unusable) barrel distortion requires countermeasures. With all corrections in place, the center performance of the lens is just outstanding but there's a sharp drop in resolution towards the outer image field at f/2.8. The quality of the outer image field improves when stopping down and is decent albeit unimpressive at medium aperture settings. Lateral CAs are low. There is some vignetting at f/2.8 even with auto-correction but it's an acceptable compromise and fairly well-controlled when stopped down. The quality of the bokeh is good for an ultra-wide lens.If you have read our reviews of its cousins, you know already that we aren't all that thrilled by the build quality. The rather mediocre plastics and sluggish AF don't scream quality. However, in all fairness - this has to be seen relative to the low price tag. Keeping this in mind, it's almost surprising that the lens features some degree of sealing against moisture as well as an impressive close focus capability with an object magnification ratio of up to 1:2.Overall, the Tamron 20mm f/2.8 Di III OSD M1:2 is a good lens for a great price but it's not an obvious choice.