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

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EF vs. EF-S

Today, in addition to its EF lenses, Canon offers lenses that use the EF-S (the S stands for “short back focus”) mount, with the chief difference being (as you might expect) lens components that extend farther back into the camera body of some of Canon’s latest digital cameras (specifically those with smaller than full-frame sensors), such as the XSi and Rebels. As I’ll explain next, this refinement allows designing more compact, less-expensive lenses especially for those cameras, but not for models like the EOS 5D, 1Ds Mark III, or 1D Mark III (even though the latter camera does have a sensor that is smaller than full frame).

Canon’s EF-S lens mount variation was born in 2003, when the company virtually invented the consumer-oriented ...

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