From the course: Introduction to Photography
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Understanding how your camera controls exposure
From the course: Introduction to Photography
Understanding how your camera controls exposure
- If I hold my hand up in front of my face, in front of that light fixture that's up there, I shield myself from some of that light. Now from where you are, you can see that I'm casting a shadow onto my face with my hand. But that's not how I think of it. I simply think of it as, blocking light that was striking my eyes. If I open and close my fingers or move my hand forward or back or in and out, I can block more or less light, in other words, I can control the exposure of my eyes to that light source. My eye has a built-in mechanism for doing this called the pupil or iris. You've all probably seen somebody elses' pupils open and close or watch your own in a mirror. As the pupil closes, less light can enter the eye and strike the light-sensitive cells on the back of the eyeball. In this way, as light levels in the room brighten, my eyes can lower their exposure to that light. Conversely, as light levels dim, my pupils will get much larger to let in more light. I can also put on…
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