Flashbulbs took longer to reach full brightness and burned for longer than electronic flashes , and had slower shutter speeds ( typically from 1/10 to 1/50 of a second ) were used on cameras to ensure proper synchronization .
Flashbulbs took longer to reach full brightness and burned for longer than electronic flashes . 
 Slower shutter speeds ( typically from 1/10 to 1/50 of a second ) were used on cameras to ensure proper synchronization .