Ed: I haven't (yet) tried D400 in Perceptol, but recall that Scott Eaton (of photo.net fame) is a big of the new D400 and favours its use with Microdol/Perceptol. Scott's times and temps are contained in the following photo.net post:(posted 8212 days ago)http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=001Ta2
Let us know what you discover...