--- title: Center Shift slug: scenario/center-shift docTags: createdAt: 2024-10-03T13:26:32.331Z --- :::hint{type="info"} This step is only available when calibrating a zoom lens ::: Centre shift accounts for the any misalignment that can happen when a lens is mounted to a camera. Centre shift can vary each time a lens is mounted, and it is good practice to repeat this step when remounting lenses that exhibit significant centre shift. ![](https://api.archbee.com/api/optimize/Qn0sdcVrDcDbwMFmH0oYn/8IZzssqQFTO5hUYkS6pA1_image.png) The user is guided through the centre shift process by the UI, to begin, press the “start centre shift calibration” button ::::WorkflowBlock :::WorkflowBlockItem Find a clear and fixed (not moving) feature in your environment ::: :::WorkflowBlockItem Zoom the lens fully tight and align the feature with the red crosshair displayed in the UI. Adjust the focus so that the feature is clearly visible ::: :::WorkflowBlockItem Ensure the pan and tilt of the camera is fixed so that the camera is unable to move at all ::: :::WorkflowBlockItem Zoom out fully on the lens ::: :::WorkflowBlockItem Visually check to see if the red crosshair has drifted from the feature it was aligned to. The “**Magnification**” slider in the lower left corner can be used to help see any drift ::: :::WorkflowBlockItem If the red crosshair has moved, it can be adjusted back into place using the onscreen gizmo ::: :::WorkflowBlockItem The process can be repeated to check that the update is applied correctly ::: ::::