https://www.vision-doctor.com/en/camera-technology-basics/sensor-and-pixel-sizes.html

Hi,

We think the setup that we see is correct.

However, do you see the virtual marker shifting if you keep the zoom fixed and rotate the camera?

if it wasn't correct by fixed zoom, check if you gave the correct field of view (FOV).

Please bear in mind that a small deviation from the real FOV can cause some drift.

If you think it gets wrong while using the zoom, then try to create at least 5 calibration points and calibrate each point to have as little slide as possible. Adding further calibration points will get you a more accurate lens calibration.

If your camera doesn't have any tracker other than the freed-protocol gimbal, then you can think of your camera as a PTZ camera. If so, take into consideration this tutorial: https://aximmetry.com/learn/tutorials/for-studio-operators/ptz-documentation/#calibration-points

If your freed-protocol gimbal is connected with a zoom tracker, then make sure it has a correct setup in your gimbal system.

In brucekim's link you can find some of the common sensor sizes, but your camera's sensor size may differ from that even if it has the same sensor format. We suggest looking up your camera's documentation to find the exact sensor size, for example in the case of Format: 1",  Diagonal: 16mm, 12.8x9.3mm, 119mm2 the 12.8 will be the sensor width that the calibrator requires.

Some cameras have their sensor's position marked if your camera does not have such a thing, then you probably want to set a distance value close to the start of the focal extensions.

Warmest regards

Thank you very much for the answers from brucekim and Eifert, my knowledge has increased again, thank you again.