Eli5: Why does a camera have to flash and time it perfectly when it takes a picture? Can’t the light just stay on?
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Aside from hardware, we also tend to want pictures of people, and if you’ve been staring into a bright light for 10 seconds, your pupils will be super contracted, meaning the photo will look really weird. Minimizing the duration of the flash (which is just a bright light) minimizes not only the pupil contraction in that one photo, but allows back to back photos without waiting on eyes to recover, because the stimulus isn’t long enough to warrant a consistent pupil response.
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