I have done some looking, but I haven't been able to find what I am looking for and be sure that it will work with my A7II. That is a wireless, expandable (add flashes) TTL (for the main, and adjustable for the secondaries) flash that is known to communicate well with Sony. I bought an aftermarket flash for my A57 (can't see spending $500 on a flash), however - it sometimes let the camera know it was there, other times, not - hence my reservations and reason for asking here. What are your suggestions?

I have used the Cactus v6 set up with the A7r mk2, using Nikon - Sony - and Canon flashguns in the same shot. all controllable from the camera base unit.