Jim, as a reviewer, let me tell you this: reviews are great for helping us make informed decisions, but the downside of reviews is that they can create either discontent or paranoia in us that wouldn't otherwise be there. Just because some other person had a bad experience (which they may or may not have exaggerated) doesn't mean that you will. I experienced the problem with this lens that it was causing battery drain on my 6D bodies even when the camera was off. Instead of griping about this excellent lens, I called Tamron, sent the lens in, and got it back a week later with the problem solved.
I obviously can't guarantee that you that your problem will be fixed as easily, but I have a fair degree of confidence that it is more likely to work than talking about it on an internet forum
I agree that actions are better than words.
Please do not take this the wrong way as you do seem to be a person of great integrity, but you have a contractual arrangement with Tamron of Canada according to http://www.canonrumors.com/forum/index.php?topic=16108.msg307475#msg307475
, the terms of which are not made known (nor do I necessarily think they should be). I am certainly not
suggesting that you are biased in your equipment review, especially in light of the fact that you bought
this lens seemingly prior to this contract being signed, but you can't be considered completely
impartial either. I think this is a fair assessment and again, I hope you are not offended.
I did more tests using the central point as a control and the outer rows of cross-type AF points for testing. Same wall, tripod, settings. All at f/2.8. Farther distance. Different time of day so different lighting.
The middle AF points in each outer column of cross-type AF points were tested. Multiple shots of each were taken. The attached are "typical.
Interestingly, the left side is close to the center in sharpness, while the right was consistently off. Neither was as bad as the outermost points.
I will give Tamron service a shot. I'll call tomorrow and arrange it.
More to follow...