Re: 70-200 VR or 80-400 VR?
My TC-20E and 70-200 focus faster than the 80-400 users I've shot alongside of, but I'm sure it didn't help that they were using D70 or D50 bodies while I was using my D2H. In lowlight, I've probably removed the TC anyhow, so I don't have a big issue with hunting. The screwdrive motor on the lower end bodies is pretty slow with big lenses.
Critical sharpness, I've found, is a bigger issue than AF when it comes to the TC-20E. Eventually, I'll have a supertele (or supeteles), but right now it's getting the job done (I'm not shooting at all right now... =( )
EDIT: Forgot to say, I'd still recommend the 70-200 mated with the TC-17E over the 80-400 or TC-20E.
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