flash powder. there’s been movies where the camera flash was a powder, ignited on a stick the camera operator is holding.
the powder burns very fast, so how did they have the photo to be in time with the flash? wouldn’t the long exposure time also make it difficult?
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Camera flashlights are designed to produce light for a defined response time and duration once triggered, all you have to do is to design the camera shutter to respect this definition, at least for a certain shutter speed.
That’s why on old camera there is a specific setting of shutter time to be used with flash, usually 1/60. The shutter operation is calibrated so the trigger time and duration of the flashlight lands right in the full open time of the shutter.
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