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Generally, yes, there are capacitors in a flash unit for a camera. The flash needs a lot of energy "right now" in order to work properly. And at suffiencient voltage to cause the flash tube to flash, too. Let's look at some particulars. Jump with me. Any battery stores energy and delivers it (when it is not damaged or run down), but the battery only has a limited ability to supply a large amount of current. In fact, most all batteries in flash units (either the ones built into the camera or the independent ones you by and plug into your camera) don't have the ability (or the output voltage!) to deliver what the flash needs to work properly. That big shot of current, and at a high enough voltage to ionize the gases within the flash tube, can't be delivered by battery. That's why the flash unit will, when turned on, take a steady amount of current from the battery, put it through a "chopper" or voltage multiplier to step it up to a sufficient level, and pour it into a capacitor to store it in preparation for discharge through the flash tube to create the flash. This also explains the few seconds needed in recovery time before you can use the flash again.

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