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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
- 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.
Guide Numbers Explained for Manual Flash - John Peltier …
- https://www.jmpeltier.com/guide-numbers-explained-manual-flash-calculator-chart/
- We’ll use a Guide Number of 60 meters in all of these examples. The flash guide number formula. 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 …
What is a guide number? Photography terms explained
- https://www.eos-magazine.com/articles/eospedia/what-is/guide-number.html
- 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 or feet and the ISO value used will also affect the result.
Understanding Camera Flash Guide Numbers, plus GN …
- https://scantips.com/lights/flashbasics1c.html
- For any given "correct flash exposure" situation, guide number is simply numerically equal to the aperture number (like the number 8 in f/8) multiplied by the subject distance (like 10 feet). Then for example, the guide number is f/8 x 10 feet = GN 80 (feet units).
Guide number - Camera-wiki.org - The free camera encyclopedia
- http://camera-wiki.org/wiki/Guide_number
- test guide number = official guide number * (√2) log2 ( film speed / speed of official guide number ) real guide number = aperture * distance between flash and image subject The effective guide number can be different depending on factors like the subject's light reflection or alternate flash usage ways like indirect flashing or flash reflector adjustment. Modern all-automatic …
Flash Photography - Understanding Guide Numbers
- http://www.naturephotographers.net/articles0703/jm0703-1.html
- Following the formula, GN=f-stop X distance, you’d have GN= f8 x 10 feet or GN of 80. Just to drive the point home, the GN for ISO 200 film would be 160 since you gain a stop of light with the faster film, so GN= f16 x 10 feet or 160. High guide number flashes provide a greater reach or working distance for a flash.
Guide numbers for flash - Photography Tips, Tricks and Techniques
- https://www.photographytips.com/page.cfm/2172
- To determine your own guide number: Set up a subject exactly ten feet away from your flash. Measure this distance accurately. Set your ISO to 100 or put a roll of ISO 100 slide film in your camera (slide film is best because it has less exposure... Make …
Flash Guide Number - The Digital SLR Guide
- https://www.digital-slr-guide.com/flash-guide-number.html
- Guide Number = [Flash to Subject Distance] x [F-Stop] Before we dig into some examples, it's important to note the following constant in the equation: ISO. When a guide number is calculated, it is often assumed that the ISO is set to 100 , since increased ISO numbers will have an impact on the guide number calculation.
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).
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