[His image sharpness, even at maximum aperture has convinced me.
Also, the image stabilizer is working properly.
This 3-Axenstabi also works against the "twisting the camera."
The autofocus is not the fastest, and he really is louder than USM's CANON]
... But I want to again evaluate the lens from the viewpoint of filming here. Since I am amateur filmmakers, I have done me this lens with a Canon 550D, because I love the film look (depth of field etc.). The Tamron 17-50mm is here in the "scene" actually the hottest. The sharpness is very good at full aperture, the Chromatic aberration is due to the compensation to detect minimal and only on photos from the outside. The manual focus is buttery soft and is very very low)
Compared to any other lens I have previously bessen with various DSLR's, I have to say this was the best yet. Sure there are a few higher priced Settled models, but for the price it's a great figure - otherwise it would not get many awards.
Big plus the way: On Tamron.de can register and receive 5 years warranty from the manufacturer.
In my world, it sets standards and therefore gets 5 stars.