I understand the energy conservation while on battery but I have seen the same with rigs connected to the wall.
In: 4
The flash only lasts a tiny amount of time and is extremely bright. As long as the shutter is open when the flash goes off, far more light will end up on the sensor from the flash than from the rest of the exposure. Flash times are just a measure of how short an exposure can the camera make while still ensuring that the flash occurs during that time.
From the point of view of the flash, it goes: shutter open, wait, wait, wait, wait, wait, wait ,wait, … lots more waiting, wait, flash, wait, lots more waiting, shutter closed.
The following idea might help: Some venues such as sports halls are lit by strobe lights instead of continuous lighting. Suppose your lights are actually flashing 100 times a second. Humans won’t notice, and will see a continuous light. Cameras will need to be set to open the aperture for 1/100 of a second, during which time exactly one flash of each strobe will occur and so the photo will get the correct exposure.
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