I love my 28-75, but I recently sent it into Tamron Canada for a clean and recalibration.
It came back with no focus corrections (even though the invoice says that the technician did indeed perform a focus calibration), and even worse, one of the front inner elements has a scuff on it!
Needless to say, I had a few colorful words when I discovered the mishap and this lens will have to go back to Tamron for further work
But, I have had good times with it...sample picture below:
