ZEISS CP.3 XD Lens Correction in Silverstack

Silverstack XT and Silverstack Lab allow to import, display and export dynamic lens correction data from ZEISS CP.3 XD lenses. In particular this involves shading and distortion correction of the recorded image.

Overview

The following steps can be executed in Silverstack:

  • Import lens correction data directly from Ambient Master Lockit Plus to consolidate it with the according clips in the library.
  • Display and review shading and distortion correction via the ZEISS lens correction panel in Silverstack.
  • Export .ZLCF lens correction files to transport lens correction data to consecutive applications such as DaVinci Resolve.

To learn more about the general workflow please visit the article ZEISS CP.3 XD Lens Correction: Workflow Overview.

Prior to importing lens correction data, clips have been recorded in the camera with the MasterLockit Plus attached to camera and lens.

Import Lens Correction Data from Ambient Master Lockit Plus

The lens correction data saved in the MasterLockit Plus holds a timecode relation to the clips recorded in the camera. The lens correction data be pulled via a network connection from the MasterLockit Plus and then be consolidated with the clips via timecode

  1. Offload the clips that have been recorded with lens correction data into the Silverstack Library
  2. Open the Import wizard through the “Import” button in the toolbar:

    Fig. 1: Choose MasterLockit Plus (CP.3XD Lens Data) from the Import menu

    Fig. 1: Choose MasterLockit Plus (CP.3XD Lens Data) from the Import menu

  3. The lens data import wizard opens. Enter the MasterLockit Plus IP Address to the “Master Lockit Address” address field to connect to the Master Lockit Plus. After a successful connection the lens data events have been connected to the clips:
    Fig.2: The lens data import wizard

    Fig.2: The lens data import wizard

    Be aware that only clips that do not hold lens correction data will be displayed in the import wizard. Learn how to remove lens correction data in the sections below.

  4. Options:
    • Lens data queried by shooting date: The lens correction data saved in the MasterLockit Plus will be queried for a certain time range around the shooting date of the clips. You can set a wider time frame for the query with this dropdown. By setting the time and date of the camera correctly you can initially make sure that the shooting date and time of the clips matches the timestamp of the lens correction data.
    • Import Options
      • Overwrite “Lens” information of clip: The lens info coming from the MasterLockit Plus can be taken over to the “Lens” metadata field in Silverstack.
      • Sensor width: The sensor width is important for the lens correction to be correctly applied. It is automatically detected by Silverstack based on:
        • Camera manufacturer
        • Camera model
        • Sensor type
        • Resolution
          In case an automatic detection is not possible (due to the lack of metadata) you have to enter the sensor width manually to be applied to all the clips receiving lens correction data.
  5. To take over the lens correction data to the clips click the “Apply Lens Data” button.

Display and Review Shading and Distortion Correction

The clips now hold lens correction data. The “ZEISS Lens Correction” entry in the General Info shows the enabled correction data:

Fig. 3

Fig. 3: ZEISS Lens Correction entry in the General Info

Click the pen icon to open the ZEISS lens correction popover:

Fig.4: The ZEISS Lens Correction Popover in the General Info

Fig.4: The ZEISS Lens Correction Popover in the General Info

  • The ZEISS Lens Correction Popover in the General info allows for
    • two different “Actions”:
      • removal of lens data (for single and multiple clips)
      • import of ZLCF file (only if no lens correction data is available for the clip)
    • multi edit of shading and distortion correction activation
    • multi edit of sensor width

The ZEISS lens correction panel can be opened from the “Look” section of the main menu:

Fig.5: The ZEISS Lens Correction Popover in the General Info

Fig.5: Open the ZEISS lens correction panel

Fig. 6: The ZEISS lens correction panel

Fig. 6: The ZEISS lens correction panel

  • The ZEISS Lens Correction panel allows for
    • separate activation and deactivation of shading and distortion correction for display in player
    • entry of distortion zoom factor
    • dynamic lens data review per clip

The lens correction data will be displayed in the Silverstack player:

Fig. 7: The shading an distortion correction is displayed in the player

To export the status of the lens correction data into a clips report please activate the “ZEISS Lens Correction” column in the table view:

Fig. 8: The ZEISS lens correction column in the clips table view

Fig. 8: The ZEISS lens correction column in the clips table view

Export ZEISS Lens Correction Files

The acquired lens correction data can now be exported per clip for consecutive productions steps. To open the export wizard go to the “Export” button menu in the toolbar and select the “ZEISS Lens Correction Files (ZLCF)” entry from the list:

Fig. 8: Open the ZLCF export wizard

Fig. 9: Open the ZLCF export wizard

This opens the ZLCF export wizard:

Fig 9: The ZLCF export wizard

Fig. 10: The ZLCF export wizard

Please be aware that the wizard only shows clips that hold lens correction data. All others will not be shown and are reflected in the status line at the bottom.

Per clip one .zlcf (ZEISS lens correction file) will be exported. After clicking “Export…” the wizard points you to select a folder for the zlcf files to be placed.