02 Apr What is Auto ISO and How to Use It

Source: Fujifilm Insider

Did you know that most modern digital cameras have the ability to set ISO automatically? Back in the film days, you would drop a roll of film into your camera and your ISO, or ASA as it was known back then, would be fixed for the entire roll. With digital, not only can you change your ISO on the fly, but you can also set your camera to adjust the ISO automatically. So what is Auto ISO and how do you use it with the shooting modes on your camera? In this article, I will answer those questions. As well, I will discuss scenarios where Auto ISO is advantageous and situations when setting ISO manually is more appropriate.

1. The Exposure Triangle

Before we talk about Auto ISO, let’s do a bit of review. The exposure triangle relates the three variables responsible for exposure: shutter speed, aperture, and ISO. Shutter speed is the length of time the sensor is exposed to light. Faster shutter speeds let less light in, and longer ones let in more. Aperture is the size of the opening in the lens. A big opening lets more light pass through to the sensor. And lastly, ISO can be thought of as the sensitivity of the sensor (though that is a bit of a simplification). The higher the ISO, the less light is needed by the sensor to create the exposure. If any one of these variables changes, the others (either one or both) have to adjust to balance out the exposure….

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