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Guide number: History, Measurement & Standards

When setting photoflash exposures, the guide number (GN) of photoflash devices (flashbulbs and electronic devices known as "studio strobes", "on-camera flashes", "electronic flashes", "flashes", "speedlights", and "speedlites") is a measure photographers can use to calculate either the required f-stop for any given flash-to-subject distance, or the…

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Guide number topic overview

The analysis highlights History, Measurement and Standards as prominent areas in the source structure around Guide number.

Related topics
37
Source areas
8
Connected nodes
45
Extracted relationships
90
Concept neighborhoods
19
Bridge connections
45

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

Details · 11 topics
Overview · 7 topics
Effect of shutter speeds · 6 topics
Understanding guide numbers · 6 topics
Effect of flash angle (zoom setting) · 3 topics
Effect of filters · 2 topics
Effect of power settings · 1 topics
History · 1 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

Understanding guide numbers

Details

Effect of power settings

Effect of flash angle (zoom setting)

Effect of filters

Effect of shutter speeds

History

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

How Guide number connects Entity context

The extracted context around Guide number shows recurring relationship patterns in the source. For example, Guide number → CalculatorScantips, Conley, EV, EV/Lux/FootCandle Conversion Chart Archived, Exposure Value, Flash Photography, History, ILFORDScantips, Memorabilia, Seaver, Sekonic, Understanding Flash Guide Numbers, Wayback Machine Another extracted example is Guide number → At, Class, GE No, General Electric Synchro-Press No, If, ISO, Shutter, The GE No, The No, Vintage, With. Use these groups to spot repeated connection types before inspecting the individual relationships.

Guide number

Top relations

related to External links · 13
Guide number → CalculatorScantips, Conley, EV, EV/Lux/FootCandle Conversion Chart Archived, Exposure Value, Flash Photography, History, ILFORDScantips, Memorabilia, Seaver, Sekonic, Understanding Flash Guide Numbers, Wayback Machine
related to With flashbulbs · 11
Guide number → At, Class, GE No, General Electric Synchro-Press No, If, ISO, Shutter, The GE No, The No, Vintage, With
related to Effect of filters · 8
Guide number → Even, Filters, Flash, For, However, Some, TTL, Unless
related to history · 8
Guide number → General Electric, In, London, No, Sashalite, Sashalite Limited, The, This
related to Units of measure · 8
Guide number → Another, As, Guide, In US, SI, Throughout, To, US
related to Effect of ISO sensitivity · 7
Guide number → Accordingly, Among, Guide, ISO, Such, To, Today
related to Effect of power settings · 7
Guide number → Full, GN, Moreover, Most, Nevertheless, Power, Reduced
related to Calculating with guide numbers · 6
Guide number → Alternatively, For, GN, It, Suppose, Thus
related to With electronic flash · 5
Guide number → Selecting, This, When, With, X-sync
related to Effect of flash angle (zoom setting) · 4
Guide number → Manufacturer, Many, Such, Virtually

Important terminology

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

guide flash number numbers iso devices distance flashbulbs exposure camera shutter power table setting either manufacturers ft one light settings

Guide number relationships Subject–Predicate–Object triples

TTTA extracted 90 structured relationships around Guide number. Examples in this analysis include feet → instance of → manufacturers of flash devices typically provide foot-based guide numbers and add nomenclature and these can make guide numbers misleadingly appear to be length-based units of measure → instance of → 30 m / 98 ft.Though nomenclature conventions. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
feetinstance ofmanufacturers of flash devices typically provide foot-based guide numbers and add nomenclature0.80text
ftinstance ofmanufacturers of flash devices typically provide foot-based guide numbers and add nomenclature0.80text
or the foot symbolinstance ofmanufacturers of flash devices typically provide foot-based guide numbers and add nomenclature0.80text
these can make guide numbers misleadingly appear to be length-based units of measureinstance of30 m / 98 ft.Though nomenclature conventions0.80text
they serve as notations to eliminate ambiguity as to which length-based system of measurement underlies the guide numbers.Calculating with guide numbersIt is easy to use guide numbers to calculate either an aperture or a flash-to-subject distanceinstance of30 m / 98 ft.Though nomenclature conventions0.80text
they serve as notations to eliminate ambiguity as to which length-based system of measurement underlies the guide numbersinstance of30 m / 98 ft.Though nomenclature conventions0.80text
incandescentinstance ofFlash devices may come with detachable color-correction gels or filters to match the color of the flash with different types of ambient lighting0.80text
fluorescentinstance ofFlash devices may come with detachable color-correction gels or filters to match the color of the flash with different types of ambient lighting0.80text
off-center subjects with distant backgrounds or scenery with elements that have non-average reflectance can confound TTL meteringinstance ofnon-average scenery0.80text
the once-popular General Electric Synchro-Press Noinstance oflargely because even medium-size bulbs0.80text
Guide numberrelated to Calculating with guide numbersIt0.60section
Guide numberrelated to Calculating with guide numbersSuppose0.60section

Related concept clusters Concept neighborhoods

The concept neighborhoods around Guide number bring nearby vocabulary together. In this analysis, examples include Number, Numbers and Flash. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • Guide number
    • Number
    • Numbers
    • Flash
    • Devices
    • Iso
    • Distance
    • Table
    • Either
    • Exposure
    • System
    • One
    • Ft
  • guide number
    • Number
    • Numbers
    • Flash
    • Devices
    • Distance
    • One
    • Iso
    • Table
    • System
    • Ft
    • Either
    • Exposure
  • flashbulbs
    • Cameras
    • Exposure
    • Electronic
    • One
    • Shutter
    • Distance
    • Measure
    • Used
    • F-stop
    • Manufacturers
    • Ms
    • Setting
  • exposures
    • Flashbulbs
    • Cameras
    • Electronic
    • Shutter
    • Number
    • Effect
    • F-stop
    • Manufacturers
    • Ms
    • One
    • Devices
    • Exposure
  • digital cameras
    • Exposure
    • Used
    • Exposures
    • Flashbulbs
    • Manufacturers
    • Shutter
    • Electronic
    • Ms
    • Settings
    • Power
    • Devices
    • Numbers
  • flash tube
    • Guide
    • Numbers
    • Iso
    • Device
    • Number
    • Camera
    • Modern
    • Power
    • Effect
    • Angle
    • Settings
    • Exposure
  • flash blindness
    • Guide
    • Numbers
    • Iso
    • Device
    • Number
    • Camera
    • Modern
    • Power
    • Effect
    • Angle
    • Settings
    • Exposure
  • flash powder
    • Guide
    • Numbers
    • Iso
    • Device
    • Number
    • Camera
    • Modern
    • Power
    • Effect
    • Angle
    • Settings
    • Exposure

Connections between topic areas Semantic bridges

For Guide number, one of the stronger structural bridges in this analysis connects Guide number with Details. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
Guide number — Details · splits 34 ⟂ 12
Guide number — Overview · splits 38 ⟂ 8
Guide number — Understanding guide numbers · splits 39 ⟂ 7
Guide number — Effect of shutter speeds · splits 39 ⟂ 7
Guide number — Effect of flash angle (zoom setting) · splits 42 ⟂ 4
Guide number — Effect of filters · splits 43 ⟂ 3

Map overview Semantic statistics

Guide number

Nodes46
Edges45
Triples90
Avg. degree1.96
Density0.043478
Components1

Source & methodology

TTTA analyzes the structure around Guide number to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as History, Measurement & Standards, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — Guide number · EN edition · Analysis: TopicsToTalkAbout

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