Hello ! So, I just ordered the cable, because yeah, why not spending extra money on cables, for using the Optical Zoom with my Sony a7R III and 16-35 2.8 GM which says it's compatible for this. And it's not working. Only digital zoom..

Anyone who can help me?

Hi alexandruchitu, for Sony cameras with MCC-Multi cable, the optical zoom can be controlled through the Focus Wheel only with the lens which has the built-in power zoom. May we verify if your lens is with the built-in power zoom?