iowapipe said:
AlanF said:
Exactly about the choice of reviews. You have to know to handle a 600mm, and those who do know have produced some very good images. The lens has a five-year warranty, but I would prefer not to have to use it.
I just saw that someone pointed to an update on lenrentals blog referring to the 'possible' issue with AF, but when I followed the link it simply took me to the comparison review they did on the lens. I checked the most recent responses on the blog and didn't see anything pertinent either. This person claimed Tamron was aware of the AF, but hadn't run into it in their testing. But again, I didn't find that on the blog link he used, or on any new postings on the blog.
I'm still learning to use this lens, but it holds great promise... One downside is that it does have visible chromatic aberation, but on the plus side, lightroom has the lens profile and corrects it very well.
The autofocus has had some problems on my 60D. AF would not work on close objects... then I realized that the switch settins was 15Meters to infinity, not 15Meters to 0...(OOPS!!!)... after that it worked fine

It is very possible that some of the complaints are due to not knowing how to use the lens.... a 600MM lens takes a bit of time to learn how to use properly.
The IS seems to work quite well, so far most of my shots have been hand-held and no complaints.
All in all, I am VERY happy with this lens and would recommend it.