Photography - Exposure.pdf

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Exposure
Exposure by John M. Setzler, Jr.
http://www.setzler.net
Release 1.0 – October 19, 2003
http://www.dpchallenge.com
Exposure
© 2003 – John M. Setzler, Jr. – All Rights Reserved
Liberty And Justice © 2003 – John M. Setzler, Jr .
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Exposure by John M. Setzler, Jr.
http://www.setzler.net
Release 1.0 – October 19, 2003
http://www.dpchallenge.com
Note from the Author:
This document was created for use on the DPChallenge website as an educational tool. If
you find this document useful, please support DPChallenge by becoming a member or by
purchasing prints from the DPCPrints website.
This document may be distributed freely in an unmodified form. I encourage you to
share this with your friends. If you have any suggestions for improvement, please let me
know.
This document may be modified and expanded occasionally. You may check for the
latest version of this document at any time by following this link:
If the link is unavailable for some reason, you may email me for a current version:
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Exposure by John M. Setzler, Jr.
http://www.setzler.net
Release 1.0 – October 19, 2003
http://www.dpchallenge.com
Table of Contents:
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Exposure by John M. Setzler, Jr.
http://www.setzler.net
Release 1.0 – October 19, 2003
http://www.dpchallenge.com
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Exposure by John M. Setzler, Jr.
http://www.setzler.net
Release 1.0 – October 19, 2003
http://www.dpchallenge.com
The Basic Elements of Exposure:
Exposure, in photographic terms, is the process of capturing light with your camera to
produce an image on film or a digital sensor. (Film and digital sensors will be referred to
as film throughout this document unless specifically noted otherwise.) Your camera
mechanically controls the incoming light and directs it to the film. The film is sensitive
to the light and is exposed.
We can create a simple analogy of exposure in terms of filling a bucket with water. We
can fill the bucket slowly with a small stream of water, or we can fill it quickly with a
large stream. In either situation, it will take a combination of time and water flow to fill
the bucket. The size of the bucket is also a consideration. A small bucket will fill more
quickly than a large one.
Based on this brief analogy, we have three items to consider. We have water flow, the
amount of time it takes to fill the bucket, and the size of the bucket. We can approach our
Fill the Bucket project from several angles. We can choose to use a larger or smaller
hose. We can choose to fill the bucket quickly or slowly. We can choose the size of the
bucket we want to fill. Whichever approach or combination of approaches we choose,
the result will be the same. We will put water in our bucket. We may fill it completely
full, partially full, or let it overflow.
How do we relate this analogy to our camera?
Light is the water that flows through our hose.
Our camera’s aperture is the hose. The camera’s aperture is the device that controls the
amount of light that is allowed into the lens. This aperture is adjustable. We can make it
larger or smaller.
Our camera’s shutter speed is the amount of time it takes to fill the bucket with water.
The camera’s shutter is the device that opens to allow the incoming light from the
aperture to expose the film and create the image.
The film’s sensitivity or ISO number is the size of the bucket. Small buckets (more
sensitive films) can be filled faster than large buckets (less sensitive films.)
The Four Elements:
So, we have four elements of exposure: light, aperture, shutter speed, and film sensitivity.
Each of these elements plays a distinct role in the process of creating a photograph. Each
of these elements may be used in creative ways.
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