Quote Originally Posted by AndreasT View Post
I have been trying to make a mental picture about the Delta-X Criterion.
My mental picture of Delta-X Criterion is that when the curve is flatter (less development), you would print on a contrasty paper. The salvage grades of paper would amplify the shadow detail that would otherwise be inadequate on a normal paper. So you can get more out of the thin shadows.

The converse happens when you develop the heck out of film. Once you decide to print on a flat paper, that paper needs more shadow separation, so you need to provide more shadow exposure.

The end result is that the speed doesn't change that much with development changes.