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In photography what does a high number ISO mean?

Updated: 8/18/2019
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14y ago

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The film is more sensitive to light than a lower numbered one. In the case of the digital camera, increasing the ISO sensitivity of the ccd (image capture device) provides the same benefits but with corresponding disadvantages. Instead of more pronounced grain that could be evident in a film based image, you get 'noise', which are signals that are not generated by light from the subject. The noise is akin to graininess in the film image.

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Q: In photography what does a high number ISO mean?
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ISO was originally a measure of the sensitivity of photographic film to light. ISO is measured in increments such as 100, 200 400 and 800. As the ISO number of the film increases the film takes better pictures in lower light however the images will be more grainy. The convention has carried over to digital cameras with the same relationship between sensitivity to light and image quality.


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