Because here are some reviews are included in which is left on the picture quality, I would first times mention that this is fine with me. But it is also nothing new that lenses vary, so I would recommend that you contact with poor results to the manufacturer. I heard from a friend that he has sent his Sigma due to the miserable in his eyes image quality to the manufacturer, who then asked him a new lens available. With such precision equipment can cause errors now time that the producers know too!
Otherwise, I am always very much that I bought the lens. While it is fairly faint, but with increasing the ISO can be some balance and if you keep your finger on the trigger and looks up later, then sharp images are possible even at shutter speeds above 1/400 and the rest is simply deletes. Example: [...]
The only drawback is the high weight - so do not want to go hiking 10 hours you!
