Nikon Tamron Sigma

Nikon Tamron Sigma
What is a good macro lens on a Nikon D80, in addition to the Nikon lens?

Sigma, Tamron and so on and how I can know the best

I read the comments but the Tamron 90mm macro lens. You can read the reviews of it (and many other items) here: http://www.shutterbug.com http://www.pbase.com/lightrules/lenstests http://www.slrgear.com/reviews/index.php www.popphoto.com/cameralenses/ http://

My Camera Lenses : Tamron 17-50mm f2.8, Sigma 50-150mm f2.8,Nikkor 50mm f1.8