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Flash Guide Number The guide number (GN) of an electronic flash is a measure of the maximum amount of light it can produce with one discharge of its capacitor.
8 Mar 2012 Zooming from wide to tele on our flash, changes the Guide Number! The spec for the Nikon SB-910 speedlight is given as: Guide number of 34/111.5 (at ISO 100, m/ft., 35-mm zoom head position, in FX format, standard illumination pattern) for high flash output volume. This means that our GN (in feet),
13 Oct 2012 This is probably a “duh” fact for many of you, but one that some of you have perhaps never heard or realized before: Did you know that the flashes in the Canon Speedlite lineup are named after their maximum guide numbers? To figure out the power of your Speedlite, just take the model name and hack off
The flash guide number is an important indicator of the power of an electronic flash for a digital SLR camera.
There are flashes available that have a GN of 220 or even higher for ISO 100 film, and many flashes with a GN lower than 110. Unfortunately, many manufacturers exaggerate their flash's GN for outdoor situations. If you'd like to check your flash for an accurate GN, do it outdoors where white reflective walls won't bounce
Thus, a subject 11 meters or 36 feet away will be correctly illuminated (GN 44 (m) ? f/4 = 11 m, and GN 144 (ft) ? f/4 = 36 ft). For the same guide number and an aperture of f/8, the light source must be 5.5 meters or 18 feet from the subject.
Pop quiz: What f/stop will your flash give you through an umbrella at ISO 100 on 1/4 power at ten feet? Not sure? Read on Guide numbers are basic, core, old-school flash photography knowledge. And I can all but hear the old-timers rolling their eyes and saying, "Gee, Dave, whaddya gonna tell us about next, bounce
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).
The flash power calculator makes it easy for you to implement the equations to work out either your aperture or range. The equation can also be rearranged to calculate the guide number of a flashgun but since you can tell the Guide Number of a Canon Speedlite by its model name (580EX II = GN 58, 430EX II = GN 43) this
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