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guide number

   Also found in: Acronyms, Wikipedia 0.01 sec.
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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I shoot in the manual mode with this flash, using the guide number to gauge the distance.
Very Important Things Every User of Canon's D60 Digital Cameras You ... by anilnagle / Arts and entertainment industries community
Three cross-indices are provided as appendices to permit rapid location of a material by CAS number, synonym, or DOT guide number.
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The SD14 Digital SLR camera features four JPEG recording modes, large and bright pentaprism viewfinder with 98% coverage, a built-in flash with a Guide Number of 11, 5-point AF system, a large 2.
Sigma Corporation by Ashbrook, Stanley B. / PSA Journal
 
 
 
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