http://www.nikonchat.com/zoom-nikkor-lens/

Sigma AF 18-200mm f/3.5-6.3 DC OS (VS) Nikon 18-200mm f/3.5-5.6 G ED-IF AF-S DX VR Zoom-Nikkor lens?
which is better?? I know that the costs of a hundred more nikon
I'd say get the Sigma, since sigma is cheaper and relatively the same. All camera lenses are equal, Why not buy one from Tesco huh?! example, with a low note, sigma is better than I know I have a compact digital. Hope this helps: OP