Quote Originally Posted by LabRat View Post
The other thing you can do (if you insist on a solenoid release, which is nice) is some older Graphic lenses had the solenoid mounted on the lensboard (by the shutter release) that operated on the standard 3 cells flashholder [...]
That is true and is all the information one needs. 4.5V actuates the shutter's solenoid. How much more simple can it be? Heck, you can jack it up to 9V. The solenoid doesn't care.