Difference between revisions of "Guide number"
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| − | The '''guide number''' is a value indicating the strength of a flashlight. | + | 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 |
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| + | <UL> guide number </UL> | ||
| + | distance between flash and image subject | ||
Revision as of 17:31, 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
- guide number
distance between flash and image subject
