http://www.nikonchat.com/nikkor-optics/

What 70-300mm lens has the better optics?
That between the Nikkor, Tamron, Sigma 70-300mm offers a better lens? Can you provide links some sites that show the comparison and / or results?
The lenses made by Nikon and Canon are known to have superior optics compared with other brands. Optics are important, but more to make a functional lens optics. if you're willing to sacrifice a bit of optical quality (usually imperceptible to all professionals, but true) that can save money or get additional features that make the lens a better tool -. Hammer made by Dewalt carbide head $ 20, -. handle plain made by XYZ hammer carbide head 20 with rubber grip. $ grip is the best tool? How of that $ 20 is going to buy the Dewalt name? how XYZ lacks quality in the metal or the construction of a hammer compared to Dewalt? Comments can obtain complete lenses and cameras www.dpreview.com
Test with Nikkor Optics on Canon XL1s