Quote Originally Posted by Michael R 1974 View Post
Harold - it is the opposite. Acutance developers tend to enhance micro contrast through specific edge effects. Assuming the same macro contrast, an acutance developer will tend to give higher micro contrast than a fine grain developer. But remember that for any film or developer micro and macro contrast move in the same direction. Typically reduced agitation frequency will help maximize micro contrast. If you want high micro contrast, the balance is to find the right combination of development time and agitation routine to maximize edge effects without flattening macro contrast too much.

Luckily Rodinal isn't a high acutance developer, these tend to give very strong edge effects and slightly coarser grain at the expense of fine detail (micro contrast).

I used Rodinal for many years but now prefer Pyrocat HD which is very like Rodinal with better blance of sharpness, definition and tonal scale.

Ian