The last variable, in controlling exposure, is ISO. ISO is a measurement of the sensitivity of the camera to light. At low ISO numbers (50 or 100), the sensor works less to gather the information. As conditions get darker, the sensor has to work harder, so we may want to adjust the ISO setting (bigger numbers). The problem with higher ISO numbers, is that the camera has to work harder, and we seeing noise, which looks like grain in film photography.
ISO 100 ISO 6400
Aperture is one of the more difficult concepts to grasp in photography. The numbers don’t seem to make sense, and it’s just messy.
Aperture is one of the three settings we adjust to get a good exposure. The other two are the shutter speed and ISO. Once you find your exposure, you can change any two of them to stay in balance, and get a different result in the photo, like changing your depth of field, or stopping the motion of a car whizzing by, or the swing of a baseball bat. But more about that later…
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