Apparently this is an error on Nikon's new lens press release and TC compatibility chart on Nikon USA's web site. They are correcting it. Yes, I know that most of us do not buy those super teles, but they are the favorites for some wildlife and sports photographers. Those lenses were announced a month ago in early July and Nikon started shipping them pretty quickly. In the original Nikon press release, they had a footnote that the new 500mm and 600mm/f4 E AF-S VR cannot AF with any TC-14E teleconverters, be it version 1, 2 or 3. They are "compatible" in the sense that the combinations work, however without auto focus. On the other hand, those super teles can AF with the TC-17E II and all flavors of the TC-20E. I somewhat overlooked that footnote, but there was a brief discussion on DPReview when the lenses were announced: http://www.dpreview.com/articles/4974121664/nikon-unveils-af-s-nikkor-500mm-f4-and-600mm-f4e-full-frame-lenses Some people, including me, thought that was merely some typo, but it is not: Jon Rista "**Compatible with TC-14E series teleconverters (AF not possible). Compatible with TC-17E and TC-20E series teleconverters. AF is only available when used with DSLR cameras that offer f/8 support. " Um, WHAT?? No AF supported with TC-14E? If that is truly the case, then WOW...EPIC FLUB!!!Yesterday, I went to Radio Road, a bird photography hot spot in the San Francisco Bay. And I noticed that a gentleman had the new 600mm E lens. I talked to him for a little while, and it turned out to be his first day with that new lens. He told me about the AF incompatibility with all TC-14E. He said that he had called Nikon, and of course Nikon is well aware of it. It is a strange incompatibility as the TC-14E III is quite new. I wonder what Nikon's difficulty may be.