The LCD screen will then show the current ISO value which can be changed either using one of the control wheels on the camera body or, with touch screen models, by tapping the + or – symbols on the screen. The photo below shows the button and value (ISO 160) on my Canon 5D mk ii. Some cameras have an ISO button which needs to be pressed before you can change its value. The photo below shows a dedicated dial on a mirrorless camera. Many advanced cameras offer a dedicated dial which provides instant access to change the value. How you change the ISO value will vary depending on your camera model. In the Semi-Automatic modes (Program Mode, Aperture Priority Mode and Shutter Priority Mode) you change the ISO values or, if your camera allows, select the Auto ISO option. In Automatic or Scene modes, and when you select Auto ISO, the camera will automatically set the ISO value to what it calculates is suitable for the situation. The other two are Aperture and Shutter Speed. ISO is one of the three fundamental elements which form part of the exposure triangle and control exposure on a digital camera. This is particularly true when other ways of capturing more light aren’t available to you – such as a larger aperture size, or a slower shutter speed. This helps in low-light situations where you need the camera to capture more light for a better-exposed image. 800, 1600 or higher) means a high sensitivity to light. This is exactly what’s needed in bright conditions in order to avoid overly-exposed photos.Ī high ISO value (e.g. 100 or 200) means low sensitivity to light. ISO 800 is half as sensitive to light as ISO 1600.Ī low ISO value (e.g. Here’s a common range: 100, 200, 400, 800, 1600, 3200, 6400.Īn ISO value of 200 makes the camera’s sensor twice as sensitive to light as ISO 100. Each value on the scale is double the previous value. ISO is measured along a scale – usually from 100 up to 1600 – or even higher on some cameras. You can adjust your camera’s ISO setting to make the sensor more or less sensitive to light, depending on the situation. Therefore, it affects the exposure of the image – that is, how much light is captured by the sensor. ISO refers to how sensitive your camera’s sensor is to light. You’ll also learn why and when you should reach for the ISO dial. In this article you’ll learn how different ISO settings affect exposure. This is especially true in low light situations. Understanding how ISO works and how it affects exposure will give you much better creative control over your photography.
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