If you want a lens that will serve both as an ultra wide zoom on full frame as well as a wide to standard zoom on a cropped sensor, then this lens is unlikely to disappoint. Used on a tripod for landscape or Architectural work, where stopping down reduces the variation in quality across the frame,...
Good control of distortion, Exceptionally sharp in the centre; Overall good performance, Well designed lens cap.
Above average fall-off at wide edges; Hood not totally effective