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 » .
Related Photography Ideas for how to calculate guide number at OneSlidePhotography.com
Artist/Photographer Lucy Martin is a photographer based in Oxfordshire who has built an online reputation on Roundographs: full 360° views displayed in a circle. Her work is awe-inspiring to say the least. Check out these experimental shots! What a great idea!
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