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St Petersburg, RU
"RE: Compatability question"
When new models come out, it is not unusual for Sigma to update the chip in lenses to be compatible. Try it, if it does not AF, Sigma will do it quickly and for no cost.If there was a compatibility problem with your version of the lens, it would also likely be with a D400 also if one ever comes into existence. In either case Sigma would take care of it.I suspect KR was just guessing or wanting to spread doubt which he has been doing towards Nikon for a while. Best, for sanity and minimum disinformation, to ignore KR StanSt Petersburg Russia
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