ISO - Photography
In very basic terms, ISO is the level of sensitivity of your camera to available light. The lower the ISO number, the less sensitive it is to the light, while a higher ISO number increases the sensitivity of your camera.
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| The difference is clear – the image on the right hand side at ISO 3200 has a lot more noise in it, than the one on the left at ISO 100. If your camera sensor needed exactly 1 second to capture a scene at ISO 100, simply by switching to ISO 800, you can capture the same scene at 1/8th of a second or at 125 milliseconds! That can mean a world of difference in photography, since it can help to freeze motion. When to increase ISO?
You should increase the ISO when there is not enough light for the camera to be able to quickly capture an image but before increasing the ISO, you should think if it is OK for you to introduce noise to the image.
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https://photographylife.com/what-is-iso-in-photography
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