Welcome to Nikonians! Check the pinned link 4th down from the top on the D3000/D5000 Users Group page. Here is a link: http://www.nikonians.org/forums/dcboard.php?az=show_topic&forum=312&topic_id=37&mesg_id=37&page= As you can see, that lens will not AF on a D40/D40X/D60/D3000/D5000 body. If you have the lens already it will work perfectly on a D90 or a used D50/D70/D70S or D80, all of which have focusing motors built into the camera body. If you are transitioning from a film body, you might find that 28mm may be a little long on a DX body. A 28mm lens on a DX body will have the equivelent field of view of 42mm on film or FX body. Good Luck and Enjoy your Nikons!