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Arriving at the best exposure for a photo is part science and part art. In Foundations of Photography: Exposure, Ben Long helps photographers expand their artistic options by giving them a deep understanding of shutter speed, aperture, ISO, and all other critical exposure practices. This course covers the basic exposure controls provided by all digital SLR cameras, as well as most advanced point-and-shoot models. Learn how to master a camera's metering modes, how to use exposure compensation and bracketing, and much more. By the end of the course, you'll know how to develop an "exposure strategy" that will allow you to effectively employ your exposure knowledge in any shooting situation.
We've covered a lot of material so far, a lot of basic theory, and some important habits that you'll need for the rest of your photographic career. We're now about to move on to more artistic uses of exposure control. So let's take a moment to recap. You've seen that the shutter is a pair of curtains that sit in front of your image sensor. When you press the shutter button to take a picture, the first curtain opens to expose the sensor, and then the second one follows to stop the exposure. You've seen that shutter speed is measured in seconds, usually fractions of a second--though it is possible to have exposure times of minutes or hours or even days, if you're shooting in extremely low light.
And you've seen that with slower shutter speeds, it's possible for a shaky camera to blur your image. Therefore, shutter speed is crucial for shooting sharp images that are free of handheld shake. This understanding of shutter speed and the effects of camera shake should help you come home with far fewer blurry images. But now it's time to consider how you can exploit the fact that a slow shutter speed can lead the things in your frame being blurry. By intentionally choosing a fast or a slow shutter speed, you can opt to render moving objects in your scene razor sharp or smear them blurry.
This allows you to create a dynamic sense of movement, or to freeze an action- packed moment of time for razor-sharp observation. This is the beginning of the creative possibility of exposure. To exploit this motion-controlling power, you need to know how to select a specific shutter speed, and your camera probably offers you many controls for doing this.
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