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

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Image Stabilization

Canon has a burgeoning line of more than a dozen lenses with built-in image-stabilization (IS) capabilities. This feature uses lens elements that are shifted internally in response to the motion of the lens during handheld photography, countering the shakiness the camera and photographer produce and which telephoto lenses magnify. However, IS is not limited to long lenses; the feature works like a champ at the 17mm zoom position of Canon’s EF-S 17-85mm f4-5.6 IS USM and EF-S 17-55mm f/2.8 IS USM lenses. Other Canon IS lenses provide stabilization with zooms that are as wide as 24-28mm.

Image stabilization provides you with camera steadiness that’s the equivalent of at least two or three shutter speed increments. (Canon claims ...

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