When it comes to the performance against bright light we could expect some problems because the tested lens is very difficult to correct in this area. After all you deal here with a complex optical construction with unique parameters that also includes wide angles of view.
Taking it all into account you can say that Sigma constructors managed to perform quite well. In the middle of the range and at the maximum focal length the problems with light artifacts are few and far between. At 17 mm focal length you can experience a diagonal flash of light when the source of bright light is pulled out right outside the frame corner. You should also notice the lack of any contrast loss across the frame.
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