Quote Originally Posted by EdSawyer View Post
Flashbulbs are the only way to do flash in combination with the focal-plane shutter. The FP shutter will not sync with an electronic flash.

There are flashbulbs available which are more powerful than electronic flash, also. (in case you need extreme amounts of light).
The most powerful handheld electronic flash does not produce as much light as the tiniest "Peanut" bulbs.