I have a D3000. As I understand it, this camera doesn't have an autofocus motor and I must buy lenses with AF-S in the tittle (the "S" meaning the lens has an autofocus motor).
I am noticing there is a massive price difference between AF lenses and AF-S lenses.
I am assuming the fastest autofocas would be if you have a motor in both the lens and the camera?
Is this true, and is there anything else I am not taking into account?