Help with ISO

Started May 15, 2013 | Discussions thread
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Doug Pardee
Doug Pardee Veteran Member • Posts: 8,103
ISO setting does two things

The ISO setting in a digital camera does two separate things:

  1. Sets the exposure index used by the metering and auto-exposure systems, and
  2. Sets the [apparent] sensitivity of the sensor to light.

These two are basically set to follow each other. A higher ISO setting will cause the auto-exposure to reduce the amount of light that reaches the sensor and will adjust the sensor to be more sensitive such that the reduced exposure results in the same overall image brightness.

You can use Exposure Compensation to provide an offset between the two factors.

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