400mm is a tremendously popular focal length for things like wildlife and landscape photography, and you can spend anywhere from under $1,000 to well over $10,000 for such a lens, depending on the image quality and your needs. In the middle of that range is the Nikon NIKKOR Z 400mm f/4.5 VR S, and this excellent video review takes a look at the lens and the sort of performance and image quality you can expect from it in practice.