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low isoThis picture was taken using ISO 100. This is a slow film which means it is not very sensitive to light. It requires maximum amounts of light to make a good exposure. Slow film is less grainy, but has less visual information.
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Greater isoThis image was taken using ISO 25600, which is an exceptionally high film speed. This film is very sensitive to light and can be used in very low light situations to capture an image. The problem with fast film speeds is that the images have lots of grain and therefore can be very 'noisy'.
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