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Guide numberSWPP Photographic Glossary

Tuesday 20th October 2020  




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Guide number

Indicates the output, or power, of an electronic flash. You can use the guide number to work out the aperture or flash to subject distance by dividing either into the guide number. A photo term sometimes used to describe a flash factor, which provides a guide to correct exposure when using flash.



 

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06/11/2019 11:36:06