Tamron SP AF 17-50 mm f/2.8 XR Di II LD Aspherical (IF)
4. Image resolution
As far as the edges of the frame are concerned, the only flaw we noticed is the slightly blurred picture for the open aperture. Starting with f/4.0 the situation is already very good and the Tamron is even a bit better than the three times more expensive Canon 17-55 f/2.8!
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The situation in the middle of the frame and with the open aperture is shown in the pictures below.