... optical center 光心; 光学中心 optical center of lens 镜片光心; 镜片光心 optical centering and edging 光学定心磨边 ...
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More specifically the camera should be rotated around the ' no parallax point' (the optical center of the camera/lens).
更具体的相机应该围绕“没有视差点（光学中心的相机/镜头）。
When zoom lens are used for military sighting, the drift of optical center caused by the change of focus length will reduce the sighting accuracy severely.
长焦变焦镜头用于军事瞄准时，变焦过程中较大的光中心漂移，降低瞄准精度。
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