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Guide number - Wikipedia
- https://en.wikipedia.org/wiki/Guide_number#:~:text=The%20magnitude%20of%20guide%20numbers%20is%20a%20function,3%20The%20ISO%20sensitivity%20setting.%20More%20items...%20
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Understanding Guide Numbers | B&H eXplora
- https://www.bhphotovideo.com/explora/photography/tips-and-solutions/understanding-guide-numbers
- 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. As a method of standardizing the process, manufacturers use ISO 100 a nd a flash-to-subject distance of 10' as fixed reference ...
What is a guide number? Photography terms explained
- https://www.eos-magazine.com/articles/eospedia/what-is/guide-number.html
- 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. The distance can be measured in metres ...
Guide Numbers Explained for Manual Flash - John Peltier …
- https://www.jmpeltier.com/guide-numbers-explained-manual-flash-calculator-chart/
- The more expensive Sony units, for example, have the same guide number but are calculated at a flash zoom setting of 105mm. So the Godox units aren’t as powerful. Pay attention to these specifications when looking at flash units. We’ll use a Guide Number of 60 meters in all of these examples. The flash guide number formula
Flash Photography - Understanding Guide Numbers
- http://www.naturephotographers.net/articles0703/jm0703-1.html
- Flash Photography - Understanding Guide Numbers. The burst of light from an electronic flash is extremely brief, lasting from what is a relatively slow 1/400th or 1/800th of a second to as fast as 1/50,000th of a second. At the slow end, the action-stopping ability of a flash is less than what is possible with a camera’s shutter speed.
Understanding Camera Flash Guide Numbers, plus GN …
- https://scantips.com/lights/flashbasics1c.html
- If you determine the correct direct flash exposure is f/8 at 10.0 feet, then that is Guide Number 8 x 10 = GN 80, and it is valid for any other combinations multiplying to 80. This computed Guide Number is applicable for whatever ISO and flash power and …
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/
- Guide Number: 197′ (60 m) at ISO 100 … for the flash-head zoomed to 200mm Guide Number: 118′ (36 m) at ISO 100 … for the flash-head zoomed to 35mm. The GN of 118 is close enough to the Nikon’s that the explanation is the same for 35mm flash-head zoom. For the flash zoomed to 35mm, the aperture would be 118/10 = f/11
Guide numbers for flash - Photography Tips, Tricks and Techniques
- https://www.photographytips.com/page.cfm/2172
- Divide the flash-to-subject distance into the guide number. That's it. The result is the correct aperture for proper exposure. For instance, working in feet, if the guide number for your ISO setting (or film speed) and your flash unit is 56 and the flash-to-subject distance is ten feet, the correct aperture to use is ƒ/5.6. (56 divided by 10 ...
Making Sense of Your Flash's Guide Number - DIY …
- https://www.diyphotography.net/making-sense-flashs-guide-number/
- Since 80÷10=8, you would dial in an aperture of f/8 for proper flash exposure. Obviously “proper” means different things to different people, but you can see how the GN gives the photographer a starting point when it comes to setting exposure values. The same flash at 20 feet, for example, would use an aperture of f/4 (80÷20=4).
Flash Guide Number - The Digital SLR Guide
- https://www.digital-slr-guide.com/flash-guide-number.html
- The flash guide number tells you - in a general sense - how powerful the flash is and hence, how much of an area it can illuminate. If your goal is to take intimate portraits in a small room, you don't need flashes with huge guide numbers. If it's your intention to photograph the interior of cathedrals, then you do.
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