ISO is one of the 3 factors of exposure along with aperture and shutter speed. ISO refers to light sensitivity of either the film or imaging sensor. Adjusting ISO changes picture quality:
Higher ISO: more light exposure, however more noise in photos creating a grainy image.
Lower ISO: less light exposure, however better quality and clearer image.
In my filmed example above, the ISO is placed at 100. This is the lowest setting my camera would produce therefore the quality is high.
This video is effective in displaying ISO because it is natural light.
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