Steve Thanks for the link. I will study/restudy it before attempting a test. Typically all I do is hit the AF-ON button while moving the focus spot and looking thru the ViewFinder.
I would only be interested in the D400 for Video. I have lost my lust for long shots, now wider is better. It will have to be 16-18 MP and have a lot of improved features to beat out the D7100 for the no doubt higher price. It might even have the new Sony 20MP sensor.