![]() TYPES OF NOISEĭigital cameras produce three common types of noise: random noise, "fixed pattern" noise, and banding noise. This is accomplished by amplifying the image signal in the camera, however this also amplifies noise and so higher ISO speeds will produce progressively more noise. ISO speed is analogous to ASA speed for different films, however a single digital camera can capture images at several different ISO speeds. Higher numbers represent greater sensitivity and the ratio of two ISO numbers represents their relative sensitivity, meaning a photo at ISO 200 will take half as long to reach the same level of exposure as one taken at ISO 100 (all other settings being equal). ![]() ISO settings are usually listed as factors of 2, such as ISO 50, ISO 100 and ISO 200 and can have a wide range of values. A camera's "ISO setting" or "ISO speed" is a standard which describes its absolute sensitivity to light.
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