A pretty serious disappointment ...

... To my Sony A99.
The Tamron is heavy and makes a very sophisticated look.
But these are already the positive properties.
Unfortunately, the lens is out of focus in almost all areas and autofocus sits at best at 3 - 4 out of 50 photos.
Too bad, because it in this (price) range from Sony is really only the 28-70, which also is not weatherproof, but is supported by the Sony software that faulty drawings, among others. properly deducts. This then is probably the fundamental problem that here Tamron is struggling to access the software to 100%, if for example the A99 allows the unit errors but eliminated finally by the software again, as I said, Sony supports only Sony , A rogue who thinks evil here ;-))