The distance at which you can take clear photos with a flash
Calculates the distance the camera flash reaches to the subject.
| Distance from the subject (d) | m*Indicates where the flash effect is present* |
Guide Number
(GN) is a measure of flash output. It is expressed as the product of the aperture value (f-number) and the shooting distance (in meters) required to achieve proper exposure at ISO 100.
Film sensitivity
(ISO) is a measure of a film’s sensitivity.The
aperture value
(F-number) is a measure of a lens’s brightness, calculated by dividing the lens’s focal length by its effective aperture.
Exposure calculation using the Guide Number (GN)
For multi-flash setups, GN' is calculated using the following formula:
This applies when flashes are fired from the same position and in the same direction.
(GN) is a measure of flash output. It is expressed as the product of the aperture value (f-number) and the shooting distance (in meters) required to achieve proper exposure at ISO 100.
Film sensitivity
(ISO) is a measure of a film’s sensitivity.The
aperture value
(F-number) is a measure of a lens’s brightness, calculated by dividing the lens’s focal length by its effective aperture.
Exposure calculation using the Guide Number (GN)
| \(\\ \hspace{30px}F=\frac{GN}{d}\sqrt{\frac{ISO}{100}}\\\) |
For multi-flash setups, GN' is calculated using the following formula:
| \( \hspace{30px}GN'= \sqrt{(GN_1)^2 + (GN_2)^2 + \cdots (GN_X)^2} \) |
This applies when flashes are fired from the same position and in the same direction.
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