121 Sa into a copal 0 shutter

[ImSoNegative]

i purchased one of these lenses in a bad shutter i have a 135mm in a very nice copal 0 shutter which i know the 121 will fit into, what i was wondering how far off will the aperature be, the shutter is a 5.6, the 121 is an f8

[cdholden]

With a Copal shutter having linear spacing between it's stops, it should be no problem to put 8 in place of 5.6, if it is as maximum opening. Stops count up from there.
Older shutters with exponential spacing (due to inverse square law) would require recalibration for each stop.

[Jim Galli]

1/3 stop