While the Zone System allows considerable freedom to control the process to achieve our visualized objectives, we also learn to visualize images within the limits imposed by the process, regardless of format. With roll films we usually must accept the requirement for uniform development of the entire roll, and we can adjust our procedure to accommodate this fact.
The absence of development control will mean a greater reliance on contrast control through the use of paper grades in printing.
— Ansel Adams, The Negative (1981, 93)