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The Panasonic Lumix DMC-G2 by Carol F. Roullard, Brian Matsumoto Ph.D

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ISO

Earlier, we referred to ISO as the gain control for the sensor. Functionally, an increase in ISO increases the sensor’s sensitivity to light so that for a given shutter speed or aperture, it can record a dimmer scene. This increases your photographic options. Obviously, it will extend your capability by allowing you to take pictures at lower light levels. When photographing sports, raising the ISO increases the camera’s sensitivity to light, so for a given f-stop, you can use a higher shutter speed. This enables you to capture a sharp image of a rapidly moving subject. Contrariwise, it allows you to maintain the highest-quality work by setting the ISO to 100. At this sensitivity, the camera renders the best images, and many scenic photographers ...

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