3ISO and Light
One way to think about the ISO setting is that it determines the light sensitivity of the camera’s image sensor.
Traditionally, you would use a low ISO setting, such as ISO 100 or 200, in bright light and high ISO settings in low light situations. The lower the light, the higher the ISO you’d need to get a hand-held photograph. When you are using a tripod or a speedlite, ISO becomes much less of an issue.
I took this hand-held image at the Jökulsárlón Glacier Lagoon after sunset. One of my goals was to stop the movement of the geese in the foreground so I knew I had to boost my ISO to get a fast enough shutter speed to stop ...
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