OK just about sums this lens up. Although it’s better made than the Canon 18-55 EFS, if I had to choose, I’d rather put up with the plastic Canon product. The Canon 18-55 EF-S has very high central sharpness whereas the Sigma 18-50 DC isn’t quite so bad at the edges, but is nowhere near as sharp in the center. It’s not even close to either the build or optical quality of the excellent Nikon 18-70mm f3.5-4.5 DX. To be fair to Sigma this isn’t an expensive lens, and for snapshots on the beach it would be fine, but I’d say if you’re spending the money on a DSLR you’ll want something better. The much more expensive Sigma 18-50 f2.8 is reputedly excellent. Otherwise stick with the kit lenses - especially if you’re buying Nikon where their 18-70 DX is where your cash should go.