#1. "RE: Hello and please help " In response to Reply # 0 Sat 26-Nov-11 05:38 AM by blw
These are "screwdriver" AF lenses, meaning that their AF mechanisms are physically driven by a motor in the camera. Of the current models, only the D90, D7000, D300s, D700 and the D3/D3s/D3x have AF motors in the camera. The other, less expensive models rely on in-lens motors, which these lenses do not have.
It is worth adding that while it may be valuable to re-use these lenses, it may not save as much as you might think. For example, the Nikkor 55-200/f3.5-5.6 AFS VR is under $200 and not only provides similar focal range as the 70-210, it has a focus motor and also offers Vibration Reduction, making it significantly easier to get quality results. For those on a really tight budget, they can be had on the used market for very little. I got mine in pristine condition for $125.
Additionally, although the DSLRs look similar to the older film cameras, they have a smaller sensor, with the result that lenses act like they're 50% longer than you're expecting. Your 50mm will act more like it's a 75mm. Accordingly you will likely want a lens such as the 18-55/f3.5-5.6 AFS VR, which is a kit lens. It behaves like what film users would expect from a 28-80mm lens.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!