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Understanding Flash's Guide Number (GN) — Daily Photography Tips
- https://www.dailyphotographytips.net/blog/flash-photography/understanding-flash-guide-number-gn
- Guide Number, usually abbreviated GN, determines power rating of flash unit that describes how powerful flash unit is and how far it can shoot. In another word, GN specifies the power of an electronic flash in a way that it can be used to determine the right f-stop to use at a particular shooting distance and ISO setting.
What is a guide number? Photography terms explained
- https://www.eos-magazine.com/articles/eospedia/what-is/guide-number.html
- Photography terms explained GN: GUIDE NUMBER The power of a built-in flash or Speedlite is given as a guide number (GN). The higher the number, the brighter the flash. A guide number can be determined by taking a correctly exposed photograph of a subject and then multiplying the camera-to-subject distance by the lens aperture used.
Understanding Camera Flash Guide Numbers, plus GN …
- https://scantips.com/lights/flashbasics1c.html
- Guide Number (GN) is a numerical method used to determine exposure of direct flash for Manual flash power levels, to automatically deal with the Inverse Square Law, making the math be trivial. Guide Number = Distance x fstop (values which actually give a proper exposure) f/stop = Guide Number / Distance (aperture for other distances)
Understanding Guide Numbers | B&H eXplora
- https://www.bhphotovideo.com/explora/photography/tips-and-solutions/understanding-guide-numbers
- GN = Subject Distance from Flash Source x f/Stop Guide numbers are based on a simple mathematical equation that states: the light output of an electronic flash is equal to the distance of the flash unit from the subject multiplied by the lens aperture, or f/stop.
DSLR Camera Basics | Flash Level (Guide Number) - Nikon
- https://imaging.nikon.com/lineup/dslr/basics/24/02.htm
- The flash guide number (GN) is a measure of the distance at which the flash can illuminate a subject. The higher the guide number, the greater the distance at which the light from the flash is sufficient for optimal exposure. The formula for calculating the guide number is as follows: Guide number (GN)=distance (meters) × aperture (f-number)
Tutorial: How to use the guide number of your flash - Tangents
- https://neilvn.com/tangents/tutorial-how-to-use-the-guide-number-of-your-flash/
- GN = distance * f-stop Your flash’s Guide Number (GN) is determined at 100 ISO, when it gives correct exposure at a certain distance, multiplied by the f-stop The idea that we can figure out the manual flash exposure by the combination of distance and aperture (for a given ISO setting), was covered in these recent topics:
Flash Photography - Understanding Guide Numbers
- http://www.naturephotographers.net/articles0703/jm0703-1.html
- If f11 is best, then by simply following the GN formula of GN= f-stop X distance, or GN= f11 X 10 feet, you’ll get a GN of 110 for ISO 100 film. If you use ISO 50 film, the GN is NOT 55. Since ISO 50 is one stop less light sensitive than ISO 100, you’d have an …
Calculator & Pocket Chart - John Peltier Photography
- https://www.jmpeltier.com/guide-numbers-explained-manual-flash-calculator-chart/
- Before we can understand anything further we need to know how the flash guide number (GN) is calculated. Distance * Aperture = GN Flash exposure on your subject is dictated by aperture, ISO, and distance ( see Inverse Square Law ). Shutter speed doesn’t have much to do with it until you get into sync speeds but that’s another topic for another day.
Flash Guide Number - The Digital SLR Guide
- https://www.digital-slr-guide.com/flash-guide-number.html
- [Flash Name] with Guide Number (GN) of 141 ft. / 43m Sometimes the ISO value will be stated, but if it isn't just remember that all guide numbers are calculated at ISO 100. The only value ever reported as the guide number is the flash to subject distance in both feet and meters.
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