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Canon EOS 40D Guide to Digital Photography by David D. Busch

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Shutter Priority

Shutter priority (Tv) is the inverse of aperture priority: you choose the shutter speed you’d like to use, and the camera’s metering system selects the appropriate f/stop. Perhaps you’re shooting action photos and you want to use the absolute fastest shutter speed available with your camera; in other cases you might want to use a slow shutter speed to add some blur to a sports photo that would be mundane if the action were completely frozen. (See Figure 4.9.) Shutter Priority mode gives you some control over how much action-freezing capability your digital camera brings to bear in a particular situation.

Figure 4.9. Lock the shutter at a slow speed to introduce blur into an action shot, as with this panned image of a distance ...

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