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If the camera does not get enough light onto the sensor or film, the images will be too dark. To correct this you can set a higher value on the ISO. All photographers are dependent on light and lighting conditions can be very variable at different locations or times of day. The ISO value is for that reason an important tool that allows the photographer to be able to work effectively in many different lighting conditions. ISO value has influence on the shutter speed and aperture for any photo shoot. Deep in the rain forest, to a concert or a moonlight walk, where there is little light available, it will by using this tool will be possible to get excellent pictures without using a tripod. This is one of the reasons why the digital cameras has m washington guitar lessons ade it much easier to be a photographer.ISO Indicate Photo Sensitivity and Measures the Sensitivity of the Image SensorWith ISO (International Standards Organization, previously known as ASA), we mean how quickly a film or digital sensor is capable of recording light. An image sensor set to ISO 100 requires twice as much light to achieve a normal exposure, as when the sensor is set to ISO 200.In order to get twice the light the shutter speed must either be doubled (e.g., from 1/60 to 1/30 seconds) or the aperture must be opened up a whole f-stop (e.g., from f/5.6 to f/4).That may not sound like a good idea to have to double the shutter speed so that we risk blurring the picture? Why doesn’t we always set the ISO speed as high as possible (e.g.