Hi Eric,

I recommend performing another calibration to see if the aspect ratio issue persists with the same 1.8 value. 

Could you clarify what you mean by “output briefly shrinking”? Lens Distortion can visually shrink the video, but you can compensate for this by adjusting the Edge Expand parameter. You can find more information on this here: https://aximmetry.com/learn/virtual-production-workflow/green-screen-production/tracked-camera-workflow/scene-control-panel/#lens-distortion 

Warmest regards,

Hi,

We are going to recalibrate the camera. Regarding that subject, I post a request on that forum asking if I could rather calibrate the camera as a PTZ or a 6 DOF one knowing it is set up on a travelling. Originally, i calibrated it as a PTZ not seeing how to do it easily as a 6 DOF one when mounted on the travelling system. As I did not get any answer to my post, I have decided to calibrate it as a 6 DOF one asking to unmount the camera from the travelling system and use a tripod to be able to move it conveniently regarding the calibration wizard provided by the Aximmetry advanced calibrator. Does it sound good for you? 

All the best

Hi Eric,

Could you please provide more details about the type of camera you are using and the tracking system involved? This information will help us answer your questions more accurately.

Also, note that lens calibration can be performed both for PTZ and 6-DOF cameras, regardless of having a position tracking system, as lens calibration does not use the tracking position data.
However, if you calibrate a 6-DOF (moveable) camera as a PTZ camera, the tracking data (Delta Head Transf) will not be calibrated. Conversely, if you calibrate a PTZ camera as a 6-DOF (moveable) camera, you only need to set the camera's position (Delta Cam Transf) and can skip the tracking calibration.
For more details on Delta Head Transf and Delta Cam Transf, refer to the following documentation: https://aximmetry.com/learn/virtual-production-workflow/tracking/advanced-information-and-features/camera-and-head-transformations/#delta-head-transf 
Also, you can set these positions for the calibration file within the Basic Calibrator.

Warmest regards,

Hi Eric,

Based on your other post (https://my.aximmetry.com/post/4984-travelling-device-camera-calibration), it appears that you are using two tracking systems: One for the PTZ camera and another for the traveling system.

If that is the case, you can combine them by assigning the Zoom Device parameter to the PTZ camera's tracking system https://aximmetry.com/learn/virtual-production-workflow/green-screen-production/tracked-camera-workflow/inputs-tracked-camera/#zoom-device  (the second bullet point in the documentation of Zoom Device describes your exact scenario)
For the traveling system, set the Tracking Device parameter accordingly: https://aximmetry.com/learn/virtual-production-workflow/green-screen-production/tracked-camera-workflow/inputs-tracked-camera/#tracking-device  

Warmest regards,

Hi,

The camera is a Sony P1 with a Canon lens. the tracking system is a Multicam spirit one. The camera is not a PTZ one. The spirit system sends all the tracking data fusing the postion data (P, T, Z, X, Y, Z) with the data recovered via the digital interface of the lens (focus,zoom).

The delta head transfer is theoritically taken in charge by the Multicam system but we can be put manually in Aximmetry.

Any comment?

Hi Eric,

So Multicam pretty much covers everything except lens calibration.

For calibration, you can choose between PTZ or 6-DOF methods.

• If you select PTZ calibration, you must keep the camera mounted on the Multicam Spirit One and avoid moving its position. Only adjust the camera’s rotation to point it at the calibration board. Also, do not set any PTZ camera properties such as tilt correction or camera height from the floor.
• If you choose 6-DOF calibration, as you did, place the camera on a tripod and move it accordingly during the lens calibration process. Once you finish, do not perform tracking calibration, since your tripod is not tracked by the Multicam Spirit One. This method should be more practical; however, please note that Aximmetry will display a blue warning in the log every time you use a calibration file created this way. The warning will mention that tracking calibration has not been performed, but you can safely ignore it, as Multicam Spirit One includes the tracking calibration in its tracking data.

Warmest regards,

Hi,

You wrote, regarding the PTZ calibration "do not set any tilt correction or camera height from the floor". Are you talking of the Aximmetry Calibrator properties? I see where the camera height is set, I even notice that I was not able to use a zero value withversion 2025 2.0. I don't see where one can set a tilt correction.The one I found looked to have been determined by the software.

One conlusion I also have is that th software update caused the issue as th original calibration was had been made with 2025 1.0.

Many thanks,

All the best

Hi,

Yes, I am referring to the Aximmetry Calibrator properties. If you set the center height from the floor to zero, you will not be able to test the calibration, but there should be no other limitations. In most cases, you need to specify a position, which is why we have this limitation, but you have encountered the rare scenario where you do not need it.
The tilt correction parameter is located directly below this setting; however, note that it may not be included in version 2025.1.0:

Warmest regards,