AccuPixel have recently updated their Zephyr training course to include working with multiple cameras.The benefits of using this method are massive - inherent scaling and accuracy without further constraints - and works well where GPS is denied (such as underwater) or where placing targets or scale bars is not possible.

This underwater scene was captured using two housed cameras. No other constraints were added and there are several 0.25m scale bars for proof of accuracy only:

Vobster Quay AFV432 and 22m Platform - Construkted Reality
https://construkted.com/asset/agtfws69uwk/
Shot with stereo cameras for scaling this model has less than 1% variation between real world and measured distances. Scale bars are 0.25m between the targets. Photogrammetry Data Upload:


More in the blog here:
Training Course Update - Stereoscopic Cameras
https://accupixel.co.uk/2024/01/23/stereoscopic-photography-cameras/
Stereoscopic Photography in Photogrammetry is useful when spatial depictions are vital, dual-lens imaging enhances accuracy in 3D models.