Am not an expert and use the lens on an NX 2000. What can I say? I'm excited! The images in the AF operation are just good. Moving from an old Sony T was worth it. There is something more to carry around than before, but the effort is really worth it. Today I 130 pictures in an overheated pool (baby swimming) done without having the slightest idea about photography, a picture better than the other. The lens ring is easy to move, it provides quick sharp. Face detection also works great (which has both more likely to do with the camera). The change from - 2 degrees to an estimated 28 degrees with high humidity has coped faster from the lens than the 18 55er. The only abnormality is that the sunscreen seems to sit somewhat loose. It was a fitting protective bag for transporting the lens. Very convenient! Strong buy recommendation!