Quote Originally Posted by Ian Grant View Post
Luckily f stop markings on rimset Compur, Copal, Epsilon, Prontor are evenly spacesd. older dial set lenses have scales which are circular versions of your second drawing.

Ian
Ian, have your vision checked.

I just took a look at some of my shutters. Rimset Compur (Compur-Rapid #0, Synchro Compur #0 and #1), uneven spacing. Prontor Press #0, even spacing, #1, uneven. Copal Press #0 and #1, even, Copal cock-and-shoot #0 and #1, even. Epsilon (not sure where it fits in the Compur/Copal scheme, it holds a 105/3.8 Xpres), uneven.

With uneven spacing, the smaller the aperture, the shorter the steps.