Nikon has announced teleconverters TX-14E and TX-20E for Z mount lenses. This is very good news! You can now use Z series lenses with these converters and for example with Z Nikkkor 400-600mm f/6.3 get equivalents of 1260mm respectively 1800mm on Z50 camera and 840mm respectively 1000mm on full frame camera’s Z5, Z6, Z7 or Z7 II.