The guide number is a measure of a flash unit's power and its ability to illuminate a scene. It indicates the maximum distance at which the flash can effectively light a subject, given a specific aperture setting. The guide number is typically expressed in meters or feet and helps photographers determine the appropriate exposure settings for their shots. A higher guide number means the flash has greater power and can cover a larger area or reach subjects farther away. This measurement is useful for adjusting flash output and ensuring proper exposure in various lighting conditions.

Definiția și sensul cuvântului „guide number” în engleză

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