Different levels of photography require different levels of understanding and skill. A “press the button, let George do the rest” photographer needs little or no technical knowledge of photography. A zone system photographer takes more responsibility. He visualizes before he presses the button, and afterwards calibrates for predictable print values.

[Minor White, Richard Zakia, Peter Lorenz “The New Zone System Manual”, Morgan & Morgan, Inc., Dobbs Ferry, New York 1978 (Fourth printing), p. 93]