Jun 3, 2019
The problem with ISO – in both film and digital photography – is that the higher you go, the more “grain” or “noise” the final image will have. In film, this is caused by larger grains of silver halide becoming more visible to the naked eye. In our digital sensors, the noise is caused by a high signal to noise ratio. That means that when you increase your ISO setting, you’re amplifying your sensor’s ability to absorb light. However, as the light sensitivity increases so does the sensor’s margin for error. The speckles – or noise – that you’ll see in an image are tiny flaws where the sensor recorded too much or too little light...
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