5 votes

Is there an adapter that will let me use a Nikkor 70-210 on my D3000?

No adaptor required, but it will be manual focus only. There is no adaptor for AF drive available.
2 votes

What caused flashing "ERR" after not using Nikon D3000 for several months?

CMOS battery or supercapacitor charging are likely culprits, as you state. Keep the battery charged to prevent losing date/time and customized settings, as well.
1 vote

Nikon focus and recompose: identifying behaviour on different models

As the question you've linked to says, this is a limitation of the camera. A workaround would be to flip the lens into manual focus after you get what you want with the focus-and-recompose method. ...
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