Now I am revising my equipment following my retirement I am looking to reduce the weight of the D850/N200-500 combination. I have read reports of people using Z6 for BIF but sorry don't get it 24MP FX cropped ? Also reports on the Z7 but how compromised is the focus tracking? Some say bad some say acceptable. Now you cannot trust the "people" on Nikonites or ugly hedgehog so an opinion from the members here would be valid. do I wait for a firmware update that never comes or the Z8?