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... for my 80-200 f/2.8. How does the Nikon TC-20e AF-I TC perform on this lens?
It doesn't ... unless you have the AF-S 80~200/2.8. The TC-20E will not mount on either the AF or AF-D versions of the 80~200/2.8 unless the female mount is modified, and if modified it is manual focus only.
I have the Tamron 1.4x SP-AF (same as the Kenko Pro 300 1.4x) and it performs surprisingly well with the 80~200/2.8D.