Wonderful lens that provides plenty of good contrast and colors already at 2.8 acc. Me. Have not noticed any chromatic abression or whatever it might be called in Swedish. There is, however, slightly "barrel distortion", ie bildet curving part and it shows even clearer if one has full fast food sensor. With an aps-c camera so vinje presents the nothing. not even if you have dual filters on it. However so vinje featuring the barely noticeable with full-frame sensor and 72mm polarizing filter is out of the question. In that case, you run the filter kit for wide angle lens.