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One of Ken Rockwell's sites states that a TC-16A teleconverter makes it autofocus;

gstark wrote:Secondly, a TC converts a non-AF lens into AF? Sounds like smoke and mirrors to me.

Use with the Nikon TC-16A Autofocusing Teleconverter

The mysterious Nikon TC-16A autofocusing teleconverter multiplies aperture and focal length by 1.6x, which makes this into a 480mm f/4.5. I'll call this a 500mm f/4.5 for convenience.

The crazy part is that this converter has AF optics inside it, so when used on some AF cameras, will autofocus a manual-focus lens! That's why it is called an "autofocusing teleconverter!"

The TC-16A really does turn this old beater manual focus 300mm f/2.8 into an autofocusing 500mm f/4.5. This combination works great on my new F6, the F4s and the N2020. It doesn't autofocus on the D200. It doesn't works on the Nikon D3, and does with the Nikon N90s.

Wide open (T4.5 or f/2.8 on the aperture ring) this combination gives some slight light falloff wide-open, on film. Stopped down to T13 (f/8 on the aperture ring), for example, there is no light falloff, even on film.