Originally Posted by
Ivan J. Eberle
Maybe I stand corrected. Seems the Supermatic shutter depicted had the 20 ms lag built in to the shutter. So, in this case the solenoid was superfluous for purposes of the delay. So here it was probably set up only for use as an electric cable release.
Other shutters, however, without sync posts on side of the shutter (Graphex or Rapax, non-Synchromatic, for instance) used similar solenoids to lag the shutter opening by 20 ms. while the M bulb ramped up to speed.
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