Will the Sigma APO 70-200mm f/2.8 EX DG work with Nikon D3100 and D70?

I would like to buy a sigma 70-200mm lens but I'm not sure if it will auto focus on the Nikon D3100 or D70?

См. статью: Will the Sigma APO 70-200mm f/2.8 EX DG work with Nikon D3100 and D70?