How can my software determine if the Zed camera is 4mm or 2.1mm?

How can my software determine if the current Zed 2i camera has a 4mm or 2.1mm lens? I would like to determine that in my code to present a top down view with the proper ranges for distance.

Hi @bobdavies2000
Welcome to the Stereolabs community.
The ZED SDK is not aware of the fact that the optics are 4 mm or 2.1 mm because the camera is calibrated and handled in the same way.
What you can do to understand what camera you are using is look at the Field of View values (C++/Python). The horizontal FoV of the 2.1 mm version is ~100° after the rectification, ~55° for the 4 mm version.