Can a remote guidehead (RGH) from a STT-camera also be used in combination with a OAG-8300 and a ST-8300 camera (combination) where the RGH is connected directly to the PC with help of a HDMI-USB adapter ?
Absolutely not! It's not an HDMI interface. The Remote Guide Head can only be connected to an STT, STX, or STXL camera.