I don't have a Nikon ATB but my friend does.
Never used a binoc for something that close but what the manufacturer says above sounds correct. Are you sure it's 8 feet and not metres? Pretty good if it's the former.the stuff on the net says it has close focus of 8 feet, does this mean that its will not be able to produce clear images of objects at less than 8 feet.
Sounds like they are using the same technolgy as some of the Steiners Ranjeet mentioned.Their optical design means that once the individual diopters have been set to the user's own personal settings, eveything further away than 15m (9.5x42) or 8m (6.5x32) will be in focus thus eliminating the need to have a central focus wheel.
Mack The Knife