Cosina (Japan) announced its Voigtlander band versions of Leica-M adapters for Nikon Z, Canon R, Fuji X and so forth, including "Close focus" adapters that contain macro extendability of the ring. Nikon Z version is similar to the one I showed here. They say it extends up to 5.5 mm. The Canon R version extends only 3 mm. The amount of extension obviously depends on the structural limitation based on the original thickness of the adapter ring. I am sure the Cosina adapters are better quality than my Chinese versions but mine is working OK for me. Having one Leica-M adapter for your camera is very useful thing considering there are so many Leica-M mount lenses (including Voigtlander VM and Zeiss ZM) out there and the fact that almost all lenses in the world have some Leica-M adapter. So combining these, you can use almost any lens on your Nikon Z body.