I had a gun 18x55mm which is blocked which he seems happened to others, the price of such a goal and after two years of use I was a little disgusted especially as the preceding canon was also broke down! I do not want an expensive purchase. As such the Tamron is totally satisfactory. Of course there is no stabilizer and there is some uncertainty at the level of 18 that disappears completely in 50 but for the value there is nothing wrong!