What does ISO measure in a camera?

ISO in a camera measures the camera’s sensitivity to light. This is a crucial aspect of photography as it influences how well the camera can capture images in various lighting conditions. A higher ISO setting enables the camera to increase sensitivity, allowing for better performance in low-light environments. It means that the camera can produce a brighter image without requiring a longer exposure time or a wider aperture.

Understanding ISO is fundamental for achieving the desired exposure in your images. Adjusting ISO can help photographers control depth of field and motion effects without compromising the quality of the image due to insufficient light. Additionally, while higher ISO settings can introduce noise or graininess in images, they also provide flexibility for capturing sharp images in darker settings. This ability enhances the versatility of the camera in different shooting situations.