Tamron 24-70/2.8 VC
See my review at Camera Labs and the 24-70/85 Shootout here.
The first sample of the lens has a decentering defect that makes the left side (resp. lower halve in portrait-orientation) less sharp than the left. Please keep this in mind when judging the performance of the lens from these samples.
The new landscape-shots are from a second copy of this lens that does not show decentering issues. But that copy did not close the aperture between f2.8 and f4.0. So I had to shoot at f7.1 to get a real f5.6 aperture...
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