What are the nominal densities of Kodak 12-step C-41 control strips (CAT 180 3709)? I could not find this information in publications Z-99M and Z131 Part 5. All I got is this:
Each strip has 12 steps—a yellow step, a D-max step,
and 10 equal-increment neutral-density steps. Step
indicators identify the LD and HD steps.
Kodak Publication Z-99M, page 17.
I understand that there is some variation in density between different batches and the correction factors are provided by Kodak. I would like to know the nominal density values for the twelve steps.
Also, for process control you only use five steps: Yellow, Dmax, HD, LD and Dmin. What is the purpose of the remaining seven?