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Understanding GN Value and how it’s Calculated

Posted by oneslidephotogaraphy On December - 21 - 2016

How to calculate GN value

How to calculate GN value



GN, short for Guide Number, Is the amount of power the light transmitted by a flash device is. It’s the result from multiplying distance (in meter or feet) and aperture.

The power of the flash is measured with the GN which describes the flash’s capacity in illuminating objects within a certain distance (in meters). Modern flashes supports TLL technology that allows it to set its power according to the distance the object is to the camera, so the risk of it being too bright or too dark can be eliminated. Read the rest of this entry »

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Related Photography Ideas for GN flash formula at OneSlidePhotography.com

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For as long as I’ve become a photographer, there’s a list of bad habits that’s as long. These bad habits of photographers could be easily avoided if you’re willing to start as early as possible to avoid further losses. These bad habits in Photography usually include: 1. Not checking the completeness of the equipment. True, […]


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