The FTZ adapter works flawlessly on my Z6 with F mount lenses. I am a long time adapter user and IMHO the FTZ is the best executed one I have tried so far - haven’t tried the Canon EF-RF but the FTZ works wonderfully. One of the reasons I am enjoying the Z6 right now is that the Nikon users who are moving to the Z system from the F system are selling gorgeous F glass for mad prices. I got the 200-500 and a 70-200 and 105mm macro for less than the cost of my Leica 50mm summilux. I am happy with that.The Z9 is Nikon's answer to its loyal customers, and the price for it is just right. All Nikon has to do is to produce the most precise lens adapters so loyal Nikon "shooters" can use all the older lenses. Maybe Nikon already produces such adapters (I don't really know sine I use Canon cameras). Anyway, Nikon is renown for its product quality, and I imagine the Z9 is another high quality product.