I'm sorry if I can not excel with technical terms and tests here, but I shoot a lot and liked, and this objective has now become my favorite lens. It's fun to zoom in birds and scan it, people who do not realize it, to portray in animated conversation, take flowers against blurred background (nice bokeh - ha, an expression I know it) in short, everything, including even need a telephoto , I did not think that you can get as much value for so little money. I also have high ISO number (goes with my 1100D only until 3200) people photographed in buildings (airport); even it it's enough (without a tripod). So, nothing to complain about, buy and look it! By Kit 18-55 and this here will serve you best.