I have the old D7000. I believe the 7000 series is the earliest Nikon Digitals that the camera bodies have the built in auto focus motors. Allowing you to use some of the older screw drive auto focus lenses. Many of those D series lenses are amazing, better than the newer G series lenses. And only a fraction of the price used. But many of the D series lenses are still being made today... With the auto focus motor in the body, that allows you to use even some of the super old Nikon lenses. Those can be picked up pretty cheap on Ebay.
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