While Nikon seems to drag their feet on lenses, I found an used Nikon 200-500 that I am using with an FTZ adapter. The good news is the adapter just disappears. You just don't feel it's on the camera. The 200-500 , for a rookie bird guy, is much better than any of the 3rd party telephotos I tried. It will take some time to learn how to use the monster well, but it is such a great fit with the 14-30 and the 24-200 in a kit I have stopped shopping for a while