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With older cameras, flashbulbs or flash cubes were used. Then, strobes were developed that used a flash tube. This gave almost limitless flashes.

These work by using a battery to charge a capacitor. When the voltage on the capacitor is high enough, it is fed to a xenon (or similar) flash tube, which then fires, giving a very short duration, high intensity flash. It then takes a small amount of time for the capacitor to recharge, before it is ready for the next flash. Some cameras use a dual flash, which has an LED flash as well as a xenon flash.

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11y ago

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