Summary: I really couldn't afford a new lens of this caliber for my Nikon camera. This was used, but when I received it in perfect condition and didn't appear to be used. I have used it a few times and been very satisfied with it.
GREAT all-purpose lens! More bang for the buck than the big brand names!
18 February 2012
Summary: I did a portrait session last night, and had a chance to compare several Nikon lenses with my newest addition to my bag, the Sigma 18-50 mm. It's quickly becoming my favorite lens! It auto-focuses very fast, and the pictures are sharp.
Summary: I needed a small, lightweight, robust lens with some wide angle capacity for daylight outdoor photography with my Nikon D5000. I chose between the Sigma and the Nikon 18-55 kit lens. The Nikon got good reviews on the optics, but the Sigma appeared more robust and still more compact.
Summary: This lens is great! I bought it for my Canon EOS 10D, and I can get pretty sharp pictures with minimal CA, purple fringing, or barrel distortion. The lens body feels rugged overall, the mount is very sturdy, and the zoom and focus rings turn smoothly.