Flash guide number

Concepts in Photography

Flash

Light is one of the most important components in photography. It’s not easy, however, to have an enough amount of light anytime and anywhere. Making use of a ﬂash allows you to optimize light settings and create a variety of effects.

Flash, also known as strobe or speed light, helps to create adequate exposure in low-light conditions. It is also useful in light-abundant situations. For example, ﬂash can be used in compensating the exposure of a subject’s shadow or capturing clearly both the subject and the background in backlit conditions.

Before correction

After correction

The model number of a ﬂash refers to the ﬂash’s power, and the maximum amount of light created is represented by a value known as a “guide number.” The bigger the guide number, the more light is emitted from the ﬂash. The guide number is achieved by multiplying the distance from the ﬂash to the subject and the aperture value when the ISO sensitivity is set to 100.

Guide number = Flash to Subject Distance X Aperture value

Aperture value = Guide number / Flash to Subject Distance

Flash to Subject Distance = Guide number / Aperture value

Therefore, if you know the guide number of a ﬂash, you can estimate an optimum ﬂash to subject distance when setting the ﬂash manually. For example, if a ﬂash has a guide number of GN 20 and is 4 meters away from the subject, the optimal aperture value is F5.0.

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