Hey everyone. I have owned a previously owned Tamron 28-75 2.8 for the last couple of years. What I've begun to notice is that when I take image with with camera on the 2.8 side, the images are often soft/out of focus. This seems to be a fairly new issue I've noticed. I have read that Tamron's have QA issues during production. Anyone else run into this problem? I don't know how old the lens is as I am the second owner. I am not sure whether to sell it and buy a new one or send it in to Tamron for inspection. Of course, I am thinking it may cost as much to fix as it is to buy a new one. Does autofocus rely on body or a lens' inherit quality? I have been meaning to upgrade to a 70d from a T1i and was wondering if that may alleviate the issue. What is everyone's thoughts?