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Canon® EOS Rebel XSi/450D Guide to Digital SLR Photography by David D. Busch

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Short Exposures

Fast shutter speeds stop action because they capture only a tiny slice of time. Electronic flash also freezes motion by virtue of its extremely short duration—as brief as 1/50,000th second or less. The Rebel XSi’s 1/4,000 second shutter speed and its built-in flash unit both can give you these ultra-quick glimpses of moving subjects. An external flash, such as one of the Canon Speedlites, offers even more versatility. You can read more about using electronic flash to stop action in Chapter 7.

In this chapter, I’m going to emphasize the use of short exposures to capture a moment in time. The XSi is fully capable of immobilizing all but the fastest movement using only its shutter speeds, which range all the way up to an astonishing ...

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