What is ISO

ISO is a measure of a camera’s sensitivity to light. It stands for International Organization for Standardization, and it refers to the standard scale that is used to measure the sensitivity of a digital camera’s image sensor. The higher the ISO value, the more sensitive the camera is to light, and the lower the ISO value, the less sensitive it is.

In photography, the ISO value is used to determine how much light is needed to properly expose an image. When the ISO value is set to a low number, the camera will require more light to produce a properly exposed image. This can be useful in bright lighting conditions, as it can help to prevent overexposure. On the other hand, when the ISO value is set to a high number, the camera will be more sensitive to light and will require less light to produce a properly exposed image. This can be useful in low light conditions, as it allows the camera to capture images without the need for additional light sources.

In general, it is best to use the lowest ISO value that will produce a properly exposed image, as higher ISO values can introduce noise (graininess) into the image. However, there may be situations where it is necessary to use a higher ISO value, such as when shooting in low light or when trying to capture a fast-moving subject. In these cases, it is important to consider the trade-off between image quality and the ability to capture the desired shot.