Bin with my judgments almost always quite mild. But a lens whose focus is not properly centered, in my opinion, useless. My cameras are working properly with my other lenses. Have to objectify my impression also repeatedly exposed test patterns. Furthermore I used a tripod. Bin truly no pixel counter, but this significant blur (in good light and tripod) makes the lens for everyday use for me unusable. Did not have to with many pictures the impression that my glasses .... In the end, it cost me this poor quality of time and energy. Expect manufacturers to perform reliable quality control. Have no desire to leave me now X lenses come, then keep after many tests a working product in your hands!