Mechanical quality leaves much to be desired ...

I have the objective now for a little over 2 years now. The image quality is quite good, although not compared at the level of L-lens, so I had recently times.
However, two problems create resentment. First, the objective now has ample play when it moves out. This resulted recently in a longer exposure to (Blue-hour-photos on tripod) that at some wind a clear image was to make. At first I had pushed it to the stand, but it is actually the front of the lens, which can be moved.

The other problem is that there are in my new EOS 70D often not well focused. So send in, I thought, because I had the warranty to 5 years extended. Now I was told at Tamron that can be corrected with focus problems only on the cameras focus, which at that time had at registration. And 82 euros for an adjustment I do not want but then not spend more at that part ...

Therefore, never a foreign lens, only Canon lenses.