I'm trying since October 20, 2011 and it is fantastic. Before I had the Sigma 17-70 2.8-4 and was a good obbiettvo, now with this new sigma can have more fun. Before judging the red ring or the aperture 6.3 lift your butt and go try it. € 510.00 but for what you want? What do you expect? Always convenient to make comparisons with optical prestigious, you should make comparisons with similar optical and price points, instead of doing the smart 80-200 f2.8 or f4 that belong to other levels. This second version deserves the red ring, by virtue of the fact that the treatment of the lenses at low dispersion is identical to that of the canon, and repeat the same. 6.3 The diaphragm does turn up their noses at the most, but if you learn to shoot like I'm doing, instead of wasting time in chat would be better. Some "teachers" in front of me after the usual stories described above, began to eloggiare mirroles and the new compact. A wee bit of common sense farebe not bad.