Noise results from different size sensors: If you've ever wondered why sensor size is referred to as a fraction of an inch, then this is one of the best explanations around, and a much more useful indication would in fact be using the crop factor, or pixel size instead. For example, if you put an 18-55mm lens on a Canon EOS 600D with a 1.6x crop factor, you get the equivalent of a 28-88mm lens in 35mm terms. The crop factor is used to calculate what the effective focal length of a lens would be in 35mm terms based on the focal length printed on the lens. Mobile phones often use a smaller 1/3.2inch sensor, as do many digital camcorders. Shown above is a relative diagram showing the size of many of the common sensors found in digital cameras, with the full frame sensor equalling the size of a 35mm film.
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