Stereo Calibration, focal length and depth

Thanks for the replies guys. Yes we were doing full calibration getting intrsinsics and extrinsics at the same time using stereoCalibration(). After thinking about this some more I realized that there are a lot of variables that I have no control over. As in I can’t say with 100% certainty that the stereo rig with the zoom lenses is actually the same distance away from the scene as the other one. I will probably need to just redo this experiment at a later date when I can check everything myself.