From @Cinesota’s Twitter feed
I covered this ground pretty thoroughly with the release of the D4, and I was surprised then that it didn’t get more ink. If you want to record the clean HDMI output, you can’t also do a simultaneous record to the internal card. If you do:
“….When video is output through HDMI interface simultaneously with recording to a CF/SD card, output image through HDMI interface will be smaller than 1,280 x 720….”
A pretty serious limitation I thought.