Flash guide number comparison

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Calculator to compare power with Guide Number (GN) of two flashes Guide Number can only be compared if both are at the same flash zoom and ISO and power 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. If the subject is more than 3 m distant ,Flash guide numbers are usually given with an ISO and a focal length. The ISO given is usually 100, but the focal lengths vary. However, if you're looking at two different flashes and one reports a guide number of 72 while another has a guide number of 190, the one with 190 is clearly