Quote Originally Posted by Francesco
Addendum: It appears that my negatives are too thin. The problem in my opinion is underexposure. What is the difference in stops between the following: SBR = 9, the first scene registers and EV range from 11 to 15, the second scene 7 to 11. Would such a difference necessitate a different development time in Pyrocat?

There would be no difference in development times in these two situations, either eith Pyrocat-HD or with other developers, unless you happened to get into the reciprocity range with the lower lighting situation. In that case you would have both an exposure issue, and a compensation issue that might have to be taken into consideration in development due to reciprocity correction. Reciprocity will vary a lot between films, as you no doubt know.