Difference between revisions of "Guide number"
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The '''guide number''' is a value indicating the strength of a flashlight. According to Andreas Feininger the guide number helps finding the right aperture for flashlight exposures with the formula | The '''guide number''' is a value indicating the strength of a flashlight. According to Andreas Feininger the guide number helps finding the right aperture for flashlight exposures with the formula | ||
− | + | <span style="font-family:Courier"> | |
aperture=<U> guide number </U><br/> | aperture=<U> guide number </U><br/> | ||
distance between flash and image subject | distance between flash and image subject | ||
+ | </span> |
Revision as of 17:37, 28 May 2006
The guide number is a value indicating the strength of a flashlight. According to Andreas Feininger the guide number helps finding the right aperture for flashlight exposures with the formula
aperture= guide number
distance between flash and image subject