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Speedlight camera flashes take lighting and performance to the next level. Take creative control with an external camera flash from Nikon. Guide Number. For any given "correct flash exposure" situation, guide number is simply numerically equal to the aperture number (like the number 8 in f/8) multiplied by the subject distance (like 10 feet). Then for example, the guide number is f/8 x 10 feet = GN 80 (feet units). Guide Number simply is the multiplied product of (flash distance x f/stop) for a proper exposure situation (normally specified for ISO 100). For example, if a certain Guide Number were equal to 100 (feet), then it says a correct direct flash exposure is f/20 at 5 feet, or f/5 at 20 feet, or f/10 at 10 feet, etc. See the links above for the latest Nikon Flash Reviews and Nikon Flash Comparisons. Also see How to Use the Nikon Wireless Flash System. See theAbout the SB-910. The SB-910 is a high-performance Speedlight compatible with Nikon Creative. Lighting System (CLS) with a guide number of 34/48 (ISO 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 photograph a subject at a given distance. If the flash unit has a guide number of 12 at ISO 100 and aperture is set to f/4, the subject can be up to 3 m away. 20 May 2014 Often confused with the power of a flash, the guide number Some speedlights– including the Nikon SB-800 units that I like to use on Guide numbers are based on a simple mathematical equation that states: the light output of an electronic flash is equal to the distance of the flash unit from the When setting photoflash exposures, the guide number (GN) of .. 430EX III-RT, Nikon SB-900, Median value. The flash guide number is an important indicator of the power of an electronic flash for a digital SLR camera.