Everything About ___
Live briefing

Everything about Guide number

Photoflash exposure setting measurement

When setting photoflash exposures, the guide number (GN) of photoflash devices is a measure photographers can use to calculate either the required f-stop for any given flash-to-subject distance, or the required distance for any given f-stop. To solve for either of these two variables, one merely divides a device's guide number by the other. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Guide numberA 5-minute orientation
  2. Skim a recent paper: Dose Number as a Tool to Guide Lead Optimization for Orally Bioavailable Compounds in Drug DiscoveryInfluential work since 2022
  3. Pick up a classic book: Complex Variables With an Introduction to ConfoThe most-reprinted book on the subject
  4. Read the landmark paper: Swimming at low Reynolds number: a beginners guide to undulatory locomotionCited 99 times
  5. Go sideways: F-numberA closely related topic
  6. Go sideways: Exposure valueA closely related topic

📖 Definitions

No dictionary entry for this exact phrase.

🏆 Landmark papers (most cited)

🆕 Influential since 2022

📚 Books worth reading

Ranked by number of editions on Open Library, a rough measure of how lasting a book is.

🔗 Related topics