// multi-utility computation suite · offline · instant · precise
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photo.guide-number Calculator
Calculates required aperture, max distance at f/2.8 for guide number applications. Uses aperture = GN / distance with inputs: guide number, distance. Helps photographers and videographers with exposure settings and image planning.
Inputs
Gn
Count of items or occurrences.
Dist
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Iso
Reference formula or conversion factor shown for context.
Results
required aperture
Reference formula or conversion factor shown for context.