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Old Jul 8, 2007, 4:53 AM   #2
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Join Date: Jul 2005
Posts: 200

All the references I've looked at for lens compatibility state that the Sigma 50 - 500mm will autofocus with the D40, since that lens is HSM, i.e., with its own focusing motor. I only have a Sigma 10-20mm HSM, and that works fine, but maybe youi can get a more definite answer from someone else. Hope that you've got an assistant to carry your gear!
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