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21 May 2010 According to wikipedia, the guide number is a measure of a flashgun's ability to “correctly illuminate" a subject at a certain focal length and ISO. A guide number of 33 thus means that the flash unit is able to send out enough light to illuminate a subject 33 meters from the flash unit away if f1.0 is used. At f4
Flash guide numbers will help you calculate f-stops for exposures using the manual position or when you bounce your illumination. Measure the flash-reflector-subject distance, and divide the total into the Flash Guide number listed for the ASA film you are using. Round off the result to
According to Wikipedia's Guide Number entry: The aperture given by the guide number is only correct for certain locations, generally indoors where a reasonable amount of "stray" flash light will be reflected from surrounding walls onto the subject. The effective GN is slightly lower outdoors as any light not
This maximized the guide number at the fastest shutter speeds since errors of even several milliseconds would cause significant underexposures. As illustrated in the graph at right for the General Electric Synchro-Flash No. 11, which was an "M" class bulb (20 ms delay to peak by design), a leaf shutter-type camera with a
8 Mar 2012 If you want all of this in a handy form on a website, here is the Flash Power Calculator on Canon Europe's site. And if you want to read up more about Guide Numbers for flash, the Wikipedia entry is thorough. Now the question remains what is the Guide Number of your flash? Time to find that instruction
When setting photoflash exposures, the guide number (GN) of photoflash devices is a measure photographers can use to calculate either the required f?stop for any given flash-to-subject distance, or the required distance for any given f?stop. To solve for either of these two
The flash guide number is an important indicator of the power of an electronic flash for a digital SLR camera.

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March 2018