how 2 get actual distance under zoom conditions

[beckhz]

Hello,

The image below shows my running results at three different focal lengths (1x, 2x, 3.5x). The values obtained are marked in the image, and they do not seem to be linear. So, how can the actual distance (in meters) be determined under zoom conditions? Thank you very much for your assistance.

[drbilal216]

@beckhz Found any solution, i have similar task need to calculate two object distance.