http://www.nikonchat.com/nikkor-70-200mm-2-8/
Sigma 70-200mm f / 2.8 for Nikon?
I'm looking for a new target, and landed on the 70-200mm. I have no money to establish the Nikkor 70-200, and I'm wondering if the Sigma 70-200 is a decent alternative. A friend of mine who also shoots Nikon recommends the Sigma, but I want other people's opinions too. It is also true that Tamron AF motor is much slower than the Sigma HSM and Nikon AF S? I heard that the type of HSM can keep up with the AF-S, but I think hard to believe since the AF-S Nikkor 70-200 is very fast in the .. I have a Nikon D60, this will be my first purchase a new lens (I have the kit lens and 55-200mm also comes with the camera) and I'm willing to live without the image stabilization.
Any of HSM Sigma or Tamron BIM work on camera, but I think will be happy to buy a used Nikon AF-S 70-200 mm f / 2.8 in the long term. Nikon lenses last for decades … the same can not be said for glasses and a generic the rules of the photograph says: "buy the lens again." This may mean waiting until you can afford the one you want and need, rather than accept second best.
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