Since I can't really justify the additional cost of the SilentWave version, I'm planning on buying the 80-200 f/2.8D AF, two ring version. But I'd like to have a 2X teleconverter. I see Tamron has a 2X that claims Nikon AF compatibility. Does it, in fact, have a drivetrain to drive the AF mechanism? What about the contacts: Does it have enough to keep all electronic lens functions operational? Is the aperture control coupling precise enough for use in P and S modes? Lastly, will it optically work well with the 80-200 f/2.8D AF N? Dan.
