ISO Definition

ISO is the number that represents how sensitive your camera is to light. A lower ISO value means there is less sensitivity to light and more light needed when taking a photo. On the other hand, a higher ISO means there is more sensitivity and less light needed to take a photo.​ This can affect the visual noise of an image, meaning the graininess of a photograph. High ISO is often used in low light situations, especially when a fast shutter speed or a narrow lens aperture is essential to achieving a creative goal.

My ISO Experiments