The images which makes this Sigma, presented me completely satisfied. Sure, you can not expect any pictures of a fixed focal length of a mega-zoom. On looking closely, you will find one or another shortcoming as chromatic aberrations, slight defocusing of the side areas and here and there a lack of intensity. But for a couple of photos enough image quality as long as one wants to make any giant poster of. :-)
But what belongs necessarily mentioned that the Sigma also has two flaws.
1. Macke
Although the zoom is mostly accurate and fast, but he "eats" itself also likes firmly. At least to my D5100. Then the Sigma is no longer the focal point.
Here then had the focus ring manually to a stop rotate or focus on an object that is as far from the desired object away. After that was also focused again without problems.
2. Macke
Unfortunately, the zoom ring wear out very quickly. While the zoom ring initially sits comfortably firm, he is so far worn out after a few 100 Zoom operations that the push from a certain angle by itself from, or retract.
On my first Sigma it hit me in the middle of New York. The first day went really fun! But after 1 week of fun was over. I stand in the canyons of Manhattan and raised the camera up, drove the push of a alone. In order to use it at all, I had to hold on with the other hand the zoom ring.
Back from vacation, I complaining the Sigma course and received without objection a new Sigma. Also in this zoom was pleasantly firm. Unfortunately non catches and the second to push auszuleiern. For this reason I contacted the Sigma support. Here I was told that it is normal in this push. One could the lens but send it and the support is then again tightly.
Unfortunately, it is constantly to send in this lens for adjusting for me no option. And what is ?! after the warranty I have decided, therefore, due to this lack of return the Sigma again. Without these shortcomings, it would have been a nice lens.
