Excerpt: In a nutshell: The "macro" is a joke; it is THE NOISIEST lens I have ever used; it is exaggeratedly heavy; the clutch focus switch is cumbersome and an odd/unnatural design; slow focus; the images are consistently soft. It took be about 48 hours to decide to return this lens.
Summary: I received the lens promptly as ordered. I have no complaints about the picture quality, it is a great improvement from most of my prior lenses. After receiving the lens I took some pictures and it work as advertised. It is 2 months after receiving the lens I started to get code 001 on my canon 5d2.
Excerpt: I have had two Tamron 70-200 SP AF70-200mm F2.8. Both lenses let me down SEVERLEY by getting stuck in manual focus. The second of the two lenses got stuck in the middle of a wedding shoot and started this god-awful clicking when I turned the focus ring while stuck between manual and auto.
Summary: I bought this camera about a year ago. In that time I used it several times a week and found the picture quality good and the autofocus fast. One day I pull out my trusty Tamron 70-200 and find it won't autofocus anymore. It wasn't dropped, there was no impact. It simply stopped working.
Summary: The auto-focus problems reported by others is true. The only way I could get this lens to auto-focus every time was to manually move the focus to infinity first. Also it's a stretch to call this a macro lens.
Summary: I must say that I am very dissapointed in this lens. I had high hopes in finding a reasonably priced 70-200 2.8 as the Canon is about triple the price. Unfortunately you do get what you pay for and while the images taken with this lens are very sharp and clear, the autofocus system is worthless.
A seriously flawed lens, with good optical characteristics
Gary Gray, Amazon
15 December 2011
Summary: The optical characteristics of this lens are very good. Compared to the Canon offerings in the same exact focal range, this lens is every bit as sharp and distortion free, and that includes using this lens at f/2.8. But..
Pros: Awesome optics. Some ghosting at times with wide open aperture. Awesome results in macro photography. 2 eggs for inconsistent af. see cons.
Cons: The lens in focus. Tried to shoot bird the lens goes out of focus from on end of range to the other then stops. Bird or plain gone. Very Frustrating. Many shots out of focus even in good light daytime. Focus not quite there. At 2.8 only the center af point works. What if you want your subject sli...