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guide number
(redirected from guide numbers)

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guide number [′gīd ‚nəm·bər]
(graphic arts)
A number that relates the output of a light source (such as a flashbulb) to the sensitivity of a particular film; when the number is divided by the distance in feet to the subject, it gives the T stop at which the lens should be set.
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With a calendar in your pocket, you will always have a reference for night photography exposures and helpful formulas for determining guide numbers for electronic flash, converting numbers for one film to guide numbers for another film and exposure correction for lens extension.
Pocket calendars. (Techniques) by Smith, Marion / PSA Journal
 
 
 
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