More thoughts ensuing regatding the old PlusX, TriX I just got. The stock is old and slightly cupped, the emusion side having shrunk a little. Given the sound stripe on either edge there is potential for the film in the gate to be cupped and the effective flange focal depth (FFD) in centre frame to be off by the stripe thickness. So I roughly measured the stripe thickness, based on a stack of eight layers, as a about 0.025mm/layer. I think this would be a significant number to a tech checking a FFD.
Edited by Gregg MacPherson, 30 July 2013 - 07:46 PM.