On the Nikon side of the house, the D40 and D60 will only work with AF-S lenses (in auto focus, you can still manual focus the AF, G or D lenses fine). If you come across an old(er) AF, G or D lens on the cheap, it will auto focus with a D50 (out of production, can be found cheap in some online sources) or with a D90 ($$$).
There’s also the D5000, which I haven’t used or spoken with anyone who has, but appears to be a D90 sensor and processor in the smaller body/frame, which means it also will be manual only on non AF-S lenses. But it’s $250 cheaper than the 90.
Nuts and bolts:
AF-S and AF-I lenses have a motor inside them. Tradeoffs: heavier, quieter, costlier, cheaper camera bodies
AF, D, and G lenses have a screw-type autofocus and require the camera body to have a motor. Ergo, exact opposite of above.
Some nikons support both types (D50, 90, and most higher-end ones) but tend to cost more and have a larger, heavier frame
The cheaper/smaller nikons do not have the internal motor (D40, 60, etc) but use their size/weight as a selling point, and come with the recomendation of only using the AF-S lenses.
/Biased
//I heart my nikons
///careful, it becomes a cult, then you start to look at canon users in a distrusting manner.
////Besides, it’s not like U-Man or Elsinore ever took any decent photos with their canons
///// ;-P~ Slashies!
Canon FTW
