There'd be more of a lag with a servo than a solenoid. This is not modern rocket science. It's more like WWII-era or 1950's tech. Solenoids were so common for flashbulb delay as to not be worth commenting upon, then. Too, there were mid-century LF cameras like the Super Graphic with it's electric release that made wiring up remotes dead simple. Remember though this was professional gear for commercial applications. Better solutions replaced the early crude tech. By the 70's there were electrically-timed and released LF shutters. For critical stop-motion stuff, it's also easier to precisely delay and time the flash pop initiation and duration than a mechanically moving shutter. (Which is the rationale behind expensive Kapture Group kit and other sophisticated triggering).
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