What is ISO (Film Speed)?

ISO is one of the three camera components that control photographic exposure:

The Exposure Triangle. The balance of these elements create "normal" exposure.

The Exposure Triangle. The balance of these elements creates “normal” exposure.

ISO stands for International Standards Organization. It is a numerical value used by digital and film cameras alike to define the light sensitivity of the recording medium. This numerical value can range from 25 to several thousands (digital filmmaking continues to push the technology and make chips that are more and more sensitive).

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