My speed graphic camera has an optar lens in a Wollensak shutter. I would like to start shooting with flash bulbs. The shutter has a position for "M" synch in red, and one in black. What's the difference between these two? Also, when I fire the shutter in the black "m" synch mode, I only need to cock the lens once. When I fire the shutter in the red "M" synch mode, I have to cock the shutter, fire the shutter, cock once again to get the shutter to open and close. What do you think of this?
David Michael Bigeleisen
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