Flash guide number meters or feet

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Manufacturers indicate this Guide Number (GN) for a reference ISO speed of 100. It is particularly striking to observe that at a distance of 1 meter/foot the Manufacturer Specified Flash Test. The Canon 77D's built in flash has a rated Guide Number of 12 meters or 39.4 feet at ISO 100. That works out to a distance ofThe guide number of a flash is the product of the f/stop of the exposure at a given distance at ISO 100. Wikipedia has a whole page on it here. But that's all Guide numbers are usually given for both feet and meters so be sure you use the right one in your calculations. The differences can be substantial. For example, Flash Guide Number Formula ; 80, f/4, 20 feet / 6 meters, GN = 20 ft. x f/4 = 80 ; 120, f/4, 30 feet / 9.1 meters, GN = 30 ft. x f/4 = 120. For example, if the meter reading is f/16 at 1/60, and the flash Guide Number is 80, then the distance of the flash should be is five feet (80 ÷ 16), Using the guide number, it is easy to calculate the how close the subject should be at a given aperture or the aperture required to photograph a subject at a The Canon 7D's built-in flash has a guide number rating of 39 feet (12 meters) at ISO 100, translating to a range of about 14 feet at ISO 100 with an f/2.8 So if the flash has a guide number of 60 and I use an aperture of 5.6 (at ISO 100), the range of my flash is 10.71 meters. However, the guide number always The guide number here (full power setting, ISO 100, and normal-angle coverage) is 37 for calculations made in meters (yellow arrow) and 120 for feet (orange).