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Flash Level (Guide Number) 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 The 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 allThe flash guide number (GN) is a useful indicator of the power of a speedlite. Guide Number = [distance from flash to subject] x [F-stop] The flash guide number tells you - in a general sense - how powerful the flash is and hence, how much of an area it can illuminate. Put another way:.