Correction in camera or in software can be used to minimise this. Chromatic aberration (CA) is the lens' inability to focus on the sensor or film all colours of visible light at the same point.
making it almost perfect as an all-in-one event lens for both stills and video. Some users may lament the lack of 24mm reach rather than 28mm, whilst others may bemoan the near 1kg weight, but Sigma ...