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Camera shake is the bane of photographers who prefer shooting in natural light. Low-light situations require slow shutter speeds, and it's hard to hand-hold a camera steadily for more than 1/60 – 1/30 second. And the problem is magnified by the addition of a zoom lens.
Canon has addressed the issue with two models of Canon PowerShot digital camera: the PowerShot S2 IS and S3 IS. Canon's Image Stabilizer technology moves a lens group in response to detecting movement of the camera in any direction during exposure – effectively eliminating blur.