Question regarding FOV

How can I physically measure the working distance for a camera?

I’ve noticed that the field of view (FOV) doesn’t match the specifications on the Mech Mind website. Could I have made mistakes during the measurement process?

The image is captured by Mech Eye PRO M V4.

Hello, camera FOV at different heights, you can refer to the FOV in the Mech-Eye Viewer software:

And you can refer to the measurement method of spatial resolution:

Also the 3D FOV concept is different from the 2D FOV. 3D FOV is the overlapping region between multiple 2D views.