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- The ISO speed is a measure of how sensitive to light a camera sensor or film is. Traditionally the photographer selected a film grade suitable for the amount of light available to shoot. Digital cameras now allow the user to adjust the sensitivity hence allowing more flexibility i.e. being able to take pictures hand held in poor light. Images taken at high sensitivity (higher ISO) have more noise in them than images taken at lower speeds. ISO 100 or up to 200 is the generally the accepted 'norm' for microstock.