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Tamron 28-75mm f2.8 XR Di Zoom AF

Review Date: Jan 29, 2005 Recommend? yes | Price paid: $379.99 | Rating: 10 

Pros: Light, quiet accurate autofocus(not quite a USM, but not a Sigma either ;-), incredibly sharp for the money, f2.8!
Focus ring rotates during autofocus.. imagine you can damage the motor if you aren't careful. This should be a problem if you are mindful.

I'm a relative newcomer and bought this lens after reading some reviews and wanting a walk-around lens that was versitile enough to do portraits, wide-angle(not quite with 20D), etc. I was skeptical given the price and previous experience with non-OEM lenses such as the Sigma 24-70 f2.8 which was a bad lens in most respects.

After testing this lens at 50mm and 70mm and comparing to my 50mm II f1.8 and 70-200L f4 it was apparent that the Tamron bested even the 50mm prime. Only until you got past f5.6 did the other two lenses match sharpness.

This lens is also very light, especially compared to the equivalent canon L lenses. Build quality is excellent and autofocus is fast and quite as I was expecting somthing akin to a Sigma. My only gripe is that the focus ring rotates while the camera autofocuses. This was a little surprising, but should be a problem as long as you pay attention and get your hand out of the way. At $379.99, almost 4X cheaper than a canon 24-70L, this is a great buy. Of course, that is until I have enough money to actually BUY the 24-70L..