It will take both tc's you mention but whether it will auto focus will depend on the body your using. The 200-400 isnt that great with even a 1.4tc never mind the 1.7tc or 2xtc. I would only want to use either on that lens in an emergency.
I very rarely use my 200-400 with a 1.4 TC let alone the 1.7 or 2x TC. I've recently picked up a d7200 for further away subjects. It's a great lens, quite sharp and a versatile zoom too.
I've recently read this review from Richard Peters about the 200-400 with 1.4 TC. Having read about teleconverters on this lens I have not used the 1.4tc as much as I did on the 300 f2.8 (that said I'm already at 400mm so not as much of a need). The purchase of a d7200 was also for use as a remote camera but doubles for longer focal length with its equivalent 600mm FoV.
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