Originally Posted by fotch
Flash bulbs meant for focal plane shutters had a longer burn time to accommodate the moving slit. Electronic flash cannot do this, AFAIK. I think the bulbs were labeled FP or something similar.
As I recall, they were called fast-rise, even-burn, long-burn types.
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.