on a more serious note, you probabl should be looking at 3rd party ext tubes. The PN11 and other Nikon original ext tubes do not have any electrical contacts at all.
Kenko has a complete set of 3 tubes (of various lengths), rather pricely, $300 or there abouts;
there is also a single 25mm tube (AF), brand Uniplus - had this for quite a few years.