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Old 01/12/2008, 01:42 AM
maroun.c maroun.c is offline
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Join Date: Apr 2001
Location: Lebanon
Posts: 2,073
oct2274 got it right.
The D40 will not autofocus with non AFS lenses.
AFS in Nikon terms mean if a lens has an internal focusing motor or not. don't know what the equivalent term for sigma is. try searching if your lens has an internal focusing motor or not. if not the you are stuck with manual focus which is not really bad in macro work when yo uget used to it. if you think it will bother you too much try returning the lens or switching it to another macro lens that has internl focusing motor.