im talking about the d3000.the nikkor lenses,and not having a built in auto-focus. AF lenses,Manual etc..please guide me through.Thanks.
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The D3000, D40, D60, D5000, etc. don’t have autofocus motors to save money and weight, which is why they’re so small. They still have autofocus though, but you need AF-S type lenses to do it. Older screw-drive AF lenses can only be used in manual focus.
Adding to the previous answers, you may have been reading about the video. The only Nikon SLR that auto-focuses in video mode is the new D300s.
Otherwise, the D3000 will auto-focus provided you’re using an AF-S lens.
When the first Auto-Focus systems for SLRs appeared the to a one used a rotating screw on the mount. It was the right solution for the time, but by modern standards the mechanisms were sometimes slow, often noisy, and restricted the layout of the focus mechanism within the lens. Most manufacturers have now reached the point where in lens focusing can be built cheaply, reliably, and will operate quickly and quietly.
Most high end DSLRs are still going to be compatible with both the legacy (screw) AF and mount contact AF systems for a few years to come. Mid to lower cameras look to be moving to mount contact AF systems rapidly!
Nikon leaves out the auto focus motor from the D40/60/3000 to save a little money and weight. Canon includes it on their entry level cameras, and still manages to weight less. Exactly how they do this, I don’t know.