I admit I don’t know anything about Ansel Adams’ Zone System. That’s a shame. I guess. I don’t know. Maybe it isn’t. There’s an awful amount of literature about it available and as I’m stingy I tried to find something on the web. This page by Norman Koren is quite good I think. At least it’s short enough. I am under the impression that you have to be amazingly anal to be able to follow the Zone System.