I've come across a couple of older Sigma lenses that my father uses on his little Nikon and out of curiousity wanted to know how they rated. However, upon looking in this forum's review section I found they aren't listed. I do seem to remember at one time running across a couple of websites that had very extensive lens reviews and comparison charts for many different brands and I'm wondering if anyone here has any links to websites like that because for the life of me I can't find them.
