# Chapter 3: Camera Settings, ISO

***ISO***

- The International Organization for Standardization (ISO) established a numerical scale to rate how sensitive different kinds of film were to light. This scale was retained for digital cameras. When you change the ISO value on a DSLR, you can think of it as changing film to something more or less light sensitive to what is currently in the camera. A big advantage of a digital camera is that you can change the ISO from shot to shot, instead of only per roll of film.
- Higher ISO numbers are more light sensitive, meaning the camera will be able to take pictures in darker environments. However, higher ISO numbers also tend to produce grainier images.
- Examples: 
    - ISO 100: suitable for a bright, sunny day
    - ISO 800: indoor spaces when not using a flash
    - ISO 1600: dim or even dark environments

<span lang="EN">This short video shows how to [set ISO on the Canon EOS 5D Mk IV](https://www.youtube.com/watch?v=zRgs3kk4ypI). </span>

<p class="callout info"><span lang="EN">For a more in depth explanation, visit [Chapter 2: Elements of Exposure, ISO](https://scil-wiki.su.edu/books/photography/page/chapter-2-elements-of-exposure-iso "Chapter 2: Elements of Exposure, ISO")</span></p>