---
title: "Calibrate selected cameras"
canonical: "https://help.vicon.com/space/ShogunMarkerless121/1253507110/Calibrate%20selected%20cameras"
format: markdown
---
You can mask and calibrate or recalibrate multiple selected Vicon cameras without having to completely re-calibrate the whole system.

Any cameras that are not selected are locked, so that any existing calibration is unaffected, and the global coordinate system is maintained.

**To add new cameras to a calibration:**

1. Connect the new cameras into the Vicon Markerless system that contains the calibrated cameras.
2. In the **System** panel, select the new cameras that are not yet calibrated (indicated by a cyan icon).
3. Instead of masking all the cameras, on the **Camera Calibration** tab, in the **Masking** section, ensure the advanced options are displayed > Macro (inline-media-image)

 and clear the **Clear Previous Masks** check box.
  This prevents your original masking from being overwritten.
4. To add the new masking to selected cameras only, in the **Masking** section, click **Selected**.
  The **Selected** button now displays **Stop** and **Auto Mask Active** is displayed in the menu bar at the top of the Workspace.
5. When the cameras are masked, click **Stop**.
6. In the same way, with the new cameras still selected, in the **Wand Wave** section, select **Selected **and, with **Auto Stop** selected, wave the wand for just the selected cameras and wait for the calibration to finish.

You don’t need to re-set the origin as the world coordinate system remains valid.