In article <4g1mjr$coc@news.uni-c.dk>, morten@nmr.imbg.ku.dk says...

>Which affordable 2x teleconverter should I buy for my
>N8008 and 80-200/2.8 AFD? Nikon, Kenko, Tamron, Vivitar?

I have used and like both the Nikkor TC200/201 and the Vivitar
2X Macro Converter. I have not used the other two. Be aware that
performance suffers at apertures wider than about f5.6, and does
not approach the level of performance you would get without the
converter until around f11. Since you lose two stops with the
converter, this makes for some mighty small apertures for
photography, which limits the usefulness of 2x
converters in most applications.
Hope This Helps