Miguel, I owned a Sigma 18-35 Aspheric. It is light and dramatically wide. I took it to France on a week's vacation and it traveled well, produced nice, handheld exposures and was a very nice lens. It requires, however, 82mm filters, which, at the time, didn't seem to be such a problem. I bought a used B&W UV filter for it to protect the front element, which was long overdue, but 82mm filters aren't cheap and represent a large investment in relation to the cost of the lens. Every time, though, that I wanted to use it I found I needed filtration of some type...either to adjust for tungsten fluorescent light or polarizing to intensify colors, and kept getting frustrated by the 82mm ring. My daughter, however, indicated a desire for a wide-angle lens for Christmas. It was now or never. I boxed up the Sigma, instructions, lens hood and B&W filter, and gave it to her for Christmas. For myself, I bought a Tokina 20-35 f/2.8, w/ 77mm, which I have all the filtration I need for now. We are both very happy. Good luck with your choice. Ben Harper
