Hi tryl,
I’m using a slighlty modified PonerineM. The original release add a 8 seconds offset between each cam, and I’ve removed this to sync the 4 Yi.
I don’t know how precise is the timing, I will test it,
I already saw what I need to change to have a better sync, but it won’t be perfect.
My next goal is to use an Arduino to control the 4 Yi’s shutter to have a better sync and log the subsecond timing.
Having a precise sync was not needed for the indoor pictures as I had to stay static, or the pictures were blurred (dark environment).