ISO (International Standards Organisation) is the measurement of the sensitivity of film being exposed to light.
How does it work?
Historically camera film had different ISO speeds which would effect how sensitive the film was to light. In the present day ISO has been digitized and now allows users to change the ISO whenever required.
(include two images, one at 100 ISO and one at 3200 ISO)
what are the differences? what happens at a high ISO?
If the ISO is pushed too high then the image is considered a noisy image because the pixels have been pushed. If the ISO is lower then the image is considered clean with there being less grain. ISO can be used at night to compensate the lack of light.
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