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Optical Image Stabilization (OIS)
In photography, image stabilization can often permit the use of shutter speeds 2–4 stops slower(exposures 4–16 times longer)
OIS either moves the optics or imager to counter movement of the camera
Image stabilization is achieved by shifting a corrective lens (or the entire lens barrel) in the direction required to cancel out movement on the optical axis resulting from camera shake.
Image stabilization is achieved by shifting the image sensor in the direction required to cancel out camera-shake and eliminate the resulting blurring of the image on the sensor.
The advantage with moving the imager, instead of the lens barrel, is that the image will be stabilized regardless of what lens barrel or imager format is being used, and no lens barrel tilt which would degrade image quality.
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