Review (Summary): "... 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. ...
... AF accuracy is the biggest problem area for this lens. Both Tamron 70-200mm lenses I've had appeared to be properly autofocus-calibrated, but neither auto focused consistently accurately. My percentage of properly-focused shots is highest at 70mm and lowest at 200mm. The accuracy percentage was low enough to raise my red flag for critical shooting situations. ..."
