ISO: Adjusting Your Camera's Sensitivity To Light

The ISO setting affects how sensitive the camera’s sensor is to the light that falls on it. It is the third element in the triangle that determines the overall exposure of the image, alongside aperture and shutter speed. ISO stands for the International Standards Organisation, and harks back to the days when photographs were captured only on film, rather than a digital sensor. The ISO ratings created an industry standard for the sensitivity of different film types.

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