ISO is the sensitivity of the camera’s matrix or film to the light. Setting the ISO makes the photo lighter or darker. The higher this parameter is, the lighter the pic will be. However, photos made with high ISO value will have more digital noise, appear grainy, and can affect the quality of the picture.

Increase the ISO only when you can’t make the pic lighter with the help of the shutter speed or the aperture (like, for example, if using a longer shutter speed will lead to blurring the objects).

General things to keep in mind when choosing the ISO:

Opt for ISO 100 for taking photos on a sunny day with bright light.
ISO 200 is best for partial shadows and on a bright day.
ISO 400 is good if you’re taking pics in cloudy weather or in a bright interior.
ISO 800 is best for taking photos during twilight and with dim lights.
ISO 1600 is good for at night or when you’re in a dark room.

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