In general, for this money you can close your eyes to the existing shoals. Fortunately, there is an M-A switch)) I bought it from the Chinese, I was not very upset for the money spent. Its pros: Actually the picture is quite satisfactory. The assembly is good. Chromatism on contrasting transitions takes place, but not as scary as many speak of it. Cons: The sharpness in the center is not even bad, but on the FF, at the edges and corners of the frame it is noticeable if the camera is FF. On the crop is not striking. Auto-focus misses, if you turn on the tracking, the motor constantly turns focusing on the points, jumping from one to another like crazy. IMHO, you will have to press the aperture on tracking focus, otherwise there will be AF misses. I revealed one more minus - When the camera is tilted down, with the shutter button half-pressed, defocusing occurs, the lens leaves the original focus point, and it is difficult for it to focus on something. It is treated by half-pressing the shutter button several times.
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