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EIS corrects the device shaking, normally resulting in noticeable image jittering within each frame of video or each still image. Camera shaking is particularly tricky with still cameras, especially when using slow shutter speeds and/or telephoto lenses. Telescopic lens-shake issues in astronomy accumulate depending on gradual atmospheric variations, which invariably lead to visibly altered object positions.
EIS cannot prevent blur from subject movement or extreme camera shaking, but it is engineered to minimize blur from normal handheld lens shaking. Certain cameras and lenses are built with more aggressive active modes and/or secondary panning features.