How does ISO affect exposure of an image?
Photography and the science of light continues with ISO. ISO is part of the Exposure triad or triangle, and works with Aperture and Shutter Speed to determine how your image is exposed. ISO in a nutshell is how sensitive your camera is to the light. I have already written about Exposure, Aperture, and Shutter Speed.
A lower ISO- 100 means the camera sensor is less sensitive to light. This setting is used in bright light situations to prevent overexposure. Bright midday sunlight, settings with bright light reflecting snow, etc. are times to use a lower ISO. Higher ISO settings are for situations with less light; cloudy days, dusk, when the snow is setting, nighttime, and indoors where there isn't a lot light.
Increasing the ISO can work well in low light situations to allow you to use a faster shutter speed and smaller aperture to get good crisp focus and deeper depth of field. However, Using a higher ISO can increase the "noise" in your image, making it grainier and foggy looking.
Below you can see the same shot with the only setting changed being ISO. I started with a low light situation with no flash. I wanted to show how increasing ISO increases the light in your image. If you enlarge each image, you will notice the increase grain in the photo as the light increases as well. My settings were f1.8, ss 1/60 and I adjusted ISO from 100 up to 6400.
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