Quote Originally Posted by Dkirk View Post
I think that with a lot of the older Compur shutters, whatever the format (later MF ones may be different) generally it is best practice, and more gentle on the mechanism to set the shutter speed first then cock the shutter, as different springs/gears engage at different speeds.
It is best to set first, then charge, but from what I've seen taking a bunch of Compurs apart, the fastest speed appears to be the only one that engages a separate spring (you can often feel resistance as the cam engages when you turn to the fastest speed). Based on my understanding of the shutter, changing between standard speeds (anything from 1/25 to 1/250) with the shutter charged shouldn't place undue stress on a properly-functioning mechanism. Of course if you've got an Old Standard like mine, advancing the film and charging the shutter are two separate actions, so it's a bit of a non-issue for me.