The Tamron 70-200mm f/2.8 Di Macro Lens delivers sharp images from a great focal length range and a wide/fast aperture. It is a light and economical package. The autofocus system is the clear downside to this lens.
Overall, and especially for the price, I'm very pleased with the image quality of the Tamron 70-200mm f/2.8 Di Macro Lens. On the wide end (70mm), this lens is sharp wide open (f/2.8) across the entire 35mm frame. Stopping down only makes a small improvement in sharpness - reduced vignetting is the primary difference seen. By 100mm, the center is still sharp wide open, but corner softness is setting in due to a slightly curved focus plane. Stopping down to f/5.6 results in excellent image quality across the frame.
The weak spot for this lens is 135mm - especially in my first purchased-retail-new copy of the Tamron 70-200mm f/2.8 Di Macro Lens which exhibited a very soft right side. This was due mostly to a curved focus plane but the left side was far sharper than the right side (examples showing the right side of this lens are shown in the ISO 12233 test results for lens sample #2). Here is a closer look at the problem that was most apparent at 135mm f/2.8.
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