Digital Cameras: What is ISO ?
ISO is the sensitivity at which your cameras sensor reacts to the light when you open the shutter. ISO is measured in a scale called ISO scale. ISO is the number indicating a digital camera sensors sensitivity to light, the higher the sensitivity, the less light is needed to make an exposure. the advantage with digital cameras is ISO is adjustable. Where as with older film cameras you had to carry different film roles to accommodate the variance in ISO. This is a Major advantage of digital cameras. A good Digital Camera would have and ISO range of ( 80 / 100 / 200 / 400 / 800 / 1600 High Sensitivity) between 80 - 1600. the higher ISO settings will allow you to take quality pictures in the darker rooms and areas with poor lighting. The higher ISO is great for poor lit areas as long as it is in the High Sensitivity ISO Range. If you increase ISO extremely you r picture becomes grainy. A good photographer will combine various things like ISO with Aperture and Shutter Speed to get a great exposure.