Canon EOS 6D: From Snapshots to Great Shots

Understanding Exposure

Photography is all about capturing light, and if you don’t understand how this happens inside your camera, you will have a difficult time grasping many of the lessons we cover in this book. Depending on the shooting mode you are working in, the camera can and will make many of the important decisions. But even if you are comfortable with this, it is important to know what choices it is making and why.

So what is exposure? By definition it is the process whereby the light reflecting off a subject reflects through an opening in the camera lens for a defined period of time onto the camera sensor. Within this process there are three core elements that determine the exposure:

• ISO: Determines how sensitive the camera sensor ...