Got this lens as a birthday gift, but sadly had to return it as it did not meet my expectations. The zoom range is great (10-20mm), but I either received a bad copy or Sigma does not offer good quality. I shot about 50-60 exposures, and I can count on one hand the number of good pictures I got from this lens. It was slow to focus, it lacked sharpness. For indoor photos this lens will leave you very disappointed. For outdoor photos, you will need great lighting and non-moving subjects.The positives: Solid built.