I'm the developer of INDI SBIG driver and recently one SBIG customer reported an issue with SBIG STT-8300 with FW8G Self-Guiding Filter Wheel . While the CCD and CFW can be controlled from INDI, the guide head is not detected. I read the SBIG SDK documentation, but I'm not sure how this case is handled, the CCD capabilities bit indicated no external guide head hardware support. Is this treated like a normal guide head? How do we detected if the guide head exists? I guess one way is to check for "G" in the CFW name, but is there a better way? I'm using SBIG Universal driver on 64bit Linux.