I have a Kenko MF7 2X teleconverter without AF and results were not bad, it works OK with a Nikkor 300 F4.5 ED AiS. But now I have instaled an AF-confirm chip on it, and I have other lenses that works with AF, AF-D, and AF-S.
So I want a teleconverter that allows me to keep exposure metering on that lens, but also that allows autofocus in AF and AF-S lenses.
I have been reading a lot about this, but didn't find advice on the forum, most posts of teleconverters date back to 2003 - 2008.
For what I have been reading there seems to be 3 teleconverters that could do the job:
Nikkor TC20E I, II, o III (with a litte hack, but i understand it won't auto Focus on AF lenses)
#1. "RE: Need recommendation for teleconverter" In response to Reply # 0 Thu 30-May-13 04:53 PM by Leonard62
Hatboro, Pa, US
None of Nikon's AFS TC's will even mount on a non-AFS lens.
I would recommend getting the Kenko PRO 300 DG-X converter. It has nearly the same performance as the Nikon TC's. It's a higher performing TC than the MC-7 however I've never owned one. I have all the Nikon AFS models and the Kenko Pro 300's and have compared them many times. The Kenko is very good and because of it's recessed front element fits on most lenses you would consider using a TC on. You don't want to use them on the DX 18-xxx lenses even if they fit though.
edit: I've used the Kenko TC's on most of my manual focus Nikkors including the AI 300mm ED f4.5 and ED-IF 4.5.