More info for poor focus problem
I don't know about any misaligned focus feature on the D80. Have you checked to see what focusing mode you are using, ie. single auto focus, closest subject, or wide area focus. Closest subject can really throw off your focus. I would switch to single auto focus mode. Another reason for poor focus would be dust on the auto focus sensor which is located under the mirror box.
Check on the focus mode, if it's not a mechanical problem, I'd be willing to bet that's what it is.
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