How to determine manual flash power

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All on camera speedlights, flashes or strobes (with a hotshoe) have a very useful power index: the Guide Number. This reference makes it possible to compareManual flash mode allows you to choose just how much light is added to the scene, whether at full power, or just a bit. Adjusting the intensity of your flash is Fast flash durations come at a cost, however, both in price and in 'power' for lack of a better word. A flash's power is determined by its Guide Number, with