Quote Originally Posted by markbarendt View Post
I find your thought here interesting, both wrong and right in my head.

Very much right IMO, in the sence that it may be tough to define where every subject falls.

Wrong in the sence that I can pick 1 point, 1 zone from the scene and place it a a specific point on paper, and similarly I can pick a single point to peg on the negative.
1 point maybe. It's easy to key off a tone in printing. For black and white negative film, it's a little harder. The only knowable point is the tested speed point and that is influenced by flare. The density at the metered exposure point depends on the shape of the film curve.