From the course: Advanced Photography: Flash
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Flash power
- If you've worked at all with a pop-up flash on a camera or even a flash on a smart phone then you already have some experience with flash power. You know that a flash casts a pool of light of limited range. Whether things inside and outside that range are properly exposed is a matter of your exposure settings. With most pop-up flashes that pool of light varies between five to 10 maybe 12 feet in diameter. If you want to work at greater distances or greater widths, maybe you're shooting a group of people lined up, or if you want to be able to fire the flash through modifiers which change the quality of light but at the cost of brightness then you're going to need a unit with more power. Unfortunately there is not a good standardized system for rating the power of a flash and the lack of such a system makes it hard to compare different models. Pretty much every flash maker will list a guide number for their flash. Here's how guide numbers work: With my flash at full-power and my…
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