Now that I have a camera that can use older glass (D200), I want a few nice AI-S lenses. I remember the buttery smoothness of the focus ring. Autofocus lenses cannot hold a handle to that. Okay, can anyone recommend for a good, reputable source of inexpensive AI-S lenses? BTW, I am thinking they should be way cheaper than autofocus (except for tilt & shift ones, of course). Am I off base on this?