fantastic fast lens which delivers a much enhanced performance over the older version which is true to be a lot cheaper but heavier - Sigma 24-70 HSM is more compact in size yet offering the same clarity factor
small and compact a real light weight Sigma lens with stabilization features for Canon, Nikon, Pentax and Sony digital SLR cameras something much better IF you enjoy shooting with the 55-200mm lens, you can take it anywhere as a secondary lens on your vacation trip and so on...